- Review Article
- Open Access
Submucous myomas: diagnosis and therapy
© Springer-Verlag 2007
- Received: 12 June 2007
- Accepted: 10 July 2007
- Published: 19 December 2007
In this review problems concerning diagnosis and therapy of submucous myomas are discussed. In abnormal blood loss, especially during menstrual periods, it is probable that the submucous locations of fibroids have the strongest relationship with the symptoms. Both in diagnostic and therapeutic possibilities, in the past decennium, a wide range of fine tuning has been developed that has changed dramatically the optimal management of submucous myomas and, therefore, of bleeding abnormalities during premenopause. Over-treatment can thus be prevented: for instance, hysterectomy in menorrhagia caused by a small pedunculated submucous fibroid. New modalities of minimally invasive treatment, however, have specific intrinsic problems that justify the development of protocols for these techniques. For the diagnosis of submucous myoma, and preceding operative treatment, intrauterine diagnosis through ultrasound or hysteroscopic imaging is mandatory. Hysteroscopic treatment of submucous myomas is the method of preference, unless the abnormality is too large or too numerous. Various practical aspects of treatment are discussed. Surgery for abnormalities that are not included in the basic training package according to Goals for the education of gynaecologists, ought to be performed by a gynaecologist with additional training and experience.
- Diagnostic imaging
- Submucous myoma
- Surgical procedures
- Treatment outcome
- Uterine haemorrhage
- Uterine neoplasms
This review formed the basis of the model protocol “Submucous myomas: diagnosis and therapy” of the Dutch Working Party on Gynaecological Endoscopy and Minimal Invasive Surgery (WGE, also referred to as the Dutch Society of Gynaecological Endoscopy and Minimal Invasive Surgery) of the Dutch Society of Obstetrics and Gynaecology (NVOG), that was accepted by the NVOG on the 20th September 2006.
The recommendations given in the guideline have been reviewed according to the NVOG guideline for setting up guidelines  and classified according to the strength of the scientific evidence in classes A1, A2, B, C or D.
This protocol aims at producing recommendations on the diagnostic and therapeutic approach based on the critical review of scientific research. In this process the principles of minimal invasiveness are given additional weight, both in diagnosis and in therapy, as well as in the prevention of complications. The advice and recommendations have been formulated for national use in the Netherlands and are intended for official use by Dutch gynaecologists only, without any pretension to be applied outside the Netherlands.
In the Cochrane Library and the Cochrane Register of controlled studies no publications were found on this specific subject; one review was found about the role of gonadotropin-releasing hormone (GnRH) analogues in the treatment of myomas in general. Moreover, a PubMed search (1966–2002) in Medline was performed. Likewise, non-systematic cross-references were searched for in Medline journals as well as in journals not participating in the Medline database.
The subject was discussed on two separate occasions during a consensus meeting of experts in the field of gynaecological endoscopy: the “Witte Raaf” convention in Noordwijk, the Netherlands (7–8 March 2002 and 13–14 March 2003).
prevention of complications of treatment
Fibroids or (leio)myomata are benign tumours of the uterine muscle that can be divided according to their localisation in the uterine wall: submucous myomas (located under the mucosal layer and protruding into the uterine cavity), subserosal (under the serosal layer and protruding into the abdominal cavity) and intramural (in the uterine wall).
The precise aetiology of myomas is unknown. Some data, however, indicate that leiomyomas originate from a single neoplastic stem cell of the smooth muscle tissue of the myometrium . Although the exact factors triggering myomatous neoplasia are unknown, oestrogens, progestins and growth factors [epidermal growth factor (EGF) and insulin-like growth factor (IGF)] all appear to play a role in the growth of fibroids.
In the literature increasing evidence can be found that suggests a genetic component in the aetiology of uterine leiomyomata, both in the primary origin and the growth potential. The first chromosome aberration that was shown to be a specific abnormality was the 1(12;14)(q14-q15;q23-q24) translocation, in 1988 . In the following years numerous publications have reported cytogenetic, molecular and genetic linkage data supporting and accounting for the evidence for genetic predisposition that had been found before, in epidemiological studies, including familial clustering and racial prevalence [6–8]. Probably, the most clinically important syndrome known presently for myomas is the autosomal dominant hereditary disease hereditary leiomyomatosis and renal cell carcinoma (HLRCC) .
In up to 25% of cases, fibroids can produce clinical symptoms ; asymptomatic myomas have been stated to exist in 20%, up to as many as 70%, of cases, in one study . Myomas are found almost exclusively during the reproductive period, with a progressive increase after the fourth decade.
Worldwide, myomas are still by far the most frequent indication for a hysterectomy: in Australia 21.7% , in the USA 27% , and in Finland 50% . Unfortunately, the studies are insufficiently stratified according to the location of the pathology. A number or risk factors are mentioned in the literature for both the existence (positive family history, black race, radiation) and the growth (nulliparity, obesity) of fibroids. These are, however, not specific for the submucous localisation and, partly, are inadequately studied.
Only 20–50% of all myomas produce symptoms, and it is the authors’ impression that in these data the submucous varieties are over-represented, despite the fact that these have the least frequent incidence (5–10%). For that matter, as a result of diagnostic shortcomings, insufficient data are available on the real prevalence of submucous myomas and their contribution to the total symptomatology. For this prevalence, values between 7.8% and 29.9% can be found in the literature [14–16]. Most authors, however, do not differentiate between patients visiting their centre directly, or being referred to their centre by the general practitioner in the case of abnormal uterine blood loss, and the secondary referrals by colleagues. Since, in the latter group, the population is highly selected, it is important to make this distinction. In the primary referral group a total prevalence of submucous myomas of 14.7% (n = 675) was found .
Abnormal uterine blood loss
Approximately 30% of women are said to complain about heavy menstrual periods without further specification of the localisation in cases of fibroids . One the other hand 40% of women with more than 200 ml menstrual blood loss are found to have myomas . Only in a secondary referral group were more submucous myomas found in a group of patients with menorrhagia than in those with metrorrhagia .
Although it has been suggested that bleeding problems in myomas are specifically associated with a submucous localisation, this is doubted by others . For instance, in recent studies, in only 40% of patients undergoing hysterectomy for fibroids and menorrhagia were submucous myomas actually found .
Little is known concerning a possible causal relationship between fibroids and blood loss. Earlier studies assumed the hypothesis that ulceration of either the mucosa overlying a submucous myoma or the opposing endometrium could be responsible for the bleeding. With hysteroscopic examination, however, this phenomenon is rarely seen.
The association between myomas and hyperplastic changes in the endometrium that has been suggested in the past has never been confirmed by other studies either [19–21]. Other possible explanations include enlargement of the endometrial surface and venous congestion due to compression, which could elucidate how entities other than submucous myomas can cause bleeding.
Dysmenorrhoea appears to be a complaint that is more specifically associated with submucous myomas. It is assumed that contractions as a result of the tendency of the uterus to expel an intracavitary structure form the main explanation for the existing pain symptoms .
In cases of dysmenorrhoea a significant over-representation of submucous myomas is found .
The discovery of a submucous myoma in a woman with an unfulfilled wish for childbearing is an attractive reason to treat the abnormality as a possible cause of her problem. Pregnancy rates between 31% and 65% have been mentioned after (hysteroscopic and laparoscopic) myomectomy, but there have been no randomised studies [19, 22].
The same lack of evidence is found for the relationship between the rate of miscarriage and the presence of myomas. In retrospective studies a reduction of loss is found after myomectomy, from 73% to 13%  and 60% to 24% , respectively, but there are no prospective or randomised trials to support these results. Submucous myomas tend to be more likely to cause recurrent miscarriage, but evidence for this relationship is even more limited .
Strangely enough, the results of hysteroscopic, laparoscopic and open surgery are not significantly different from one another . A causal relationship has never been proven. Although 27–40% of women with multiple fibroids have been described as being subfertile, in the majority of cases other additional possible causes can be established . A recent meta-analysis shows that only myomas with a submucous or intracavitary component are associated with impaired procreational potential, and that hysteroscopic treatment may well be beneficial in these cases .
Dilatation and curettage
Dilatation and curettage (D & C) should no longer be used for the diagnosis in the case of myoma but should be reserved as an instrument for the retrieval of endometrial tissue for histological examination in the absence of focal abnormality [3, 27–29].
More and more diagnostic hysteroscopies and curettages are now avoided by the ruling out of polyps, myomas or malignancies with the use of transvaginal ultrasound (NVOG guideline “Abnormaal bloedverlies in de postmenopause”: “Abnormal bleeding in postmenopause” ).
The mean sensitivity of transvaginal ultrasound for the diagnosis of myomas is 94% (range 62–100%), with a specificity of 98% [positive predictive value (PPV) 82–90%, negative predictive value (NPV) 96–98%] [31–33].
In the diagnosis of intracavitary abnormalities a likelihood ratio of 0.04 was found for a normal transvaginal ultrasound and 9.09 for an abnormal ultrasound, in comparison with hysteroscopy as the gold standard .
Sonohysterography or saline infusion sonohysterography (SIS) is an ultrasound examination performed after the uterine cavity has been filled with normal physiological saline solution as a contrast medium. In comparative studies between various methods of intra-uterine diagnostic procedures, SIS appears to be more reliable than transvaginal ultrasound alone and as predictive as hysteroscopy. The reliability of transvaginal ultrasound increases with the addition of saline solution as a contrast medium [17, 33–36]. In a meta-analysis by de Kroon et al. the following data were established in this respect: sensitivity 0.95 (95% CI 0.93 to 0.97), specificity 0.88 (95% CI 0.85 to 0.92), likelihood ratios 8.23 (95% CI 6.2 to 11) and 0.06 (95% CI 0.04 to 0.09) .
In a study of 52 women, even with abdominal sonohysterography immediately preceding a hysterectomy (with histology as the gold standard) 100% values were found for sensitivity, specificity and positive and negative predictive values .
With the aid of saline contrast agent the presence, size and location of the myoma can be assessed more accurately [34, 38]. As a consequence, the operability and risk of complications are easier to determine, as is the distance between the fibroid and the serosa, which is also important preoperative information [3, 39].
The advantages over hysteroscopy include the ability to visualise both uterine cavity and wall simultaneously, the fact that the procedure is possible even in the case of heavy bleeding, and the lower burden it imposes on the patient in terms of pain , but it remains to be proven whether this is still valid in comparison with the vaginoscopic, or no-touch, technique in hysteroscopy. Systematic studies are not available, but the existing literature on the subject suggests that the differences will then disappear of perhaps even turn around in favour of hysteroscopy [41, 42].
On account of substantial evidence, many authors consider a diagnostic hysteroscopy to be the gold standard for diagnosis in the uterine cavity [29, 43–45], but this diagnostic procedure has its limitations (see Sonohysterography).
For the determination of the presence of submucous myomas in several studies, sensitivity, specificity and positive and negative predictive values of hysteroscopy did not differ significantly from those of SIS [31, 32, 40], although, in other studies, these were lower: sensitivity 82%, specificity 87% .
Although, especially in infertility workup, the first suggestion of a submucous myoma may well arise in a hysterosalpingography (HSG), it is not to be recommended as a primary investigation item due to the extremely low reliability with respect to intracavitary abnormalities, where up to 32 % of false positive results have been described [46–49]. Moreover, this procedure has the disadvantage of being a radiation burden to the patient.
Magnetic resonance imaging
Although some authors advocate the use of magnetic resonance imaging (MRI) for the diagnosis of submucous myomas, its limited availability and its costs will limit the routine use of this procedure. Nevertheless, the use of MRI in the case of myomas appears to be worthwhile for the precise assessment of the size and intramural extent. For this purpose it is superior to all former techniques . This can therefore be taken into consideration and MRI can be recommended as a first choice diagnostic procedure in all advanced minimally invasive surgery (e.g. large type II myomas). If available, MRI could, at any rate, be an alternative in those cases in which SIS has failed or is contra-indicated.
Under ultrasound guidance, both through the vaginal and the abdominal approach, it is possible for the surgeon to perform histological examination of a myoma to differentiate it from adenomyosis or sarcoma . It is, however, questionable whether the early detection of adenomyosis has such additional value that an invasive form of diagnostics can be justified. The same applies to the detection of sarcomas, in view of the extreme rarity of this form of malignancy, especially in premenopause. In addition, with sarcomas, there is also concern about possible spill. Moreover, a biopsy might not be representative, and thus adenomyosis elsewhere in the myometrium can never be excluded. For these reasons the diagnostic modality of puncture biopsy has not been broadly adopted.
Colour pulsed Doppler ultrasound
Doppler ultrasound offers one the possibility to determine blood flow profiles in normal and abnormal organs in the small pelvis . Although some authors suggest that adenomyosis and sarcomas can be distinguished from myomas on account of differences in flow indices , these data have not been confirmed in later studies, and there is lack of consensus concerning the methodology used.
The possibilities of 3-D ultrasound seem promising. In the literature to date, however, no evidence can be found for a substantial additional value in comparison with the aforementioned techniques. In a study of endometrial polyps, both 3-D ultrasound and 3-D sonohysterography had a higher specificity than the comparable two-dimensional technique (69.5% vs 88.8% and 94.1% vs 100%, respectively); the 2-D sonohysterography still appeared to score better than the 3-D conventional ultrasound . For submucous myomas no comparative data are available.
Classic approaches: myomectomy, embolisation, hysterectomy
In the literature there is consensus concerning the fact that myomectomy, embolisation and hysterectomy for smaller submucous myomas can be considered to be over-treatment . These treatment options are reserved for those cases where the fibroids are too large or not responding to pre-treatment. An extensive discussion of these techniques is beyond the scope of this review, since they are not specific for the submucous localisation of myomas.
With respect to embolisation, a remark should be made concerning the fact that some investigators consider a submucous myoma to be a (relative) contraindication in view of the risk of necrosis in the uterine cavity, with expulsion and possibly the subsequent increased risk of septicaemia [53, 54].
For all forms of surgical treatment of myomas in patients who still wish to conceive, the potential consequences for a pregnancy should be taken into account, such as uterine rupture and, theoretically, placenta accreta or increta. Systematic research on this subject is not available, merely case reports [55, 56].
As the least invasive treatment modality a hysteroscopic transcervical resection of myomas (further referred to as TCRM) is an obvious approach in the case of submucous localisation. For the treatment of menorrhagia success rates between 71% and 96% have been claimed in the literature [3, 57–59]. Chances of one treatment being sufficiently effective appear to depend strongly on the degree of intramural extent: type 0 96%; type I 74%; type II 67% (n = 93; 2–8 year follow-up) . The deeper the myoma penetrates into the myometrium, the higher the chances are to end up with an incomplete resection and hence the necessity to perform a repeat procedure: 0% in type 0 up to 36% in type II .
For that matter, there are indications that, even after an incomplete resection, the symptoms may disappear (through spontaneous regression or resorption of fibroid tissue): in one study this was the case in up to 66% of cases . Whether there is a maximum to the amount of tissue that be left behind is not clear from the article.
Moreover, the success is also dependent on the presence of any other myomas that might increase chances of recurrence of the problem. It has been suggested that TCRM is most successful in uteri of normal size with no more than two submucous myomas and that, perhaps, this treatment should be limited to this specific group of patients .
In addition there is a limit to the size of each individual fibroid that is suitable for hysteroscopic resection: 4 to 5 cm is mostly considered to be the maximum feasible diameter in this respect [2, 59]. With larger diameters, medical pre-treatment can be considered in order to reduce the size to fall within the range of these maxima (see 2, 7).
The precautionary measures to be taken all are related to one on more of the following complications that could thus be prevented: intravasation, infection, perforation and bleeding.
In the event of a “trans-urethral resection” (“TUR”) syndrome (see Use of distension media and instrumentation), the duration of the procedure and the location of the myoma appear to be the most important risk factors . Others mention the size of the myoma to be an additional factor, but it is most likely that there is a correlation between size and duration of the procedure. Since the speed of removal of tissue depends on its volume, this correlation is probably exponential: the relationship between the volume and the radius of a (spherical) myoma is determined by the formula 4/3 πr3. Preoperative medical therapy can reduce the size of the myoma that is to be removed.
Although many drugs have been studied, clinically only GnRH analogues are capable of significantly reducing the size of myomas, with percentages between 30 and 70, when these had been used for 3 to 4 months preceding surgical intervention [61–66]. Although, in these studies, no distinction is made in fibroid location and no endoscopic procedures were involved, it seems that part of the results may be extrapolated to be applied to submucous myomas and TCRM as well.
There are no randomised controlled prospective trials that specifically prove the effect of GnRH analogue reduction on submucous myomas. Retrospective studies, however, have suggested the existence of this effect [70–72]. In one study no additional benefit of pre-treatment was determined for either the patient or the surgeon in submucous myomas with a diameter smaller than 3 cm . Whether or not the pre-operative reduction of a myoma is indicated in every case cannot be adequately answered on the basis of the actual literature available. Contrary to what might be expected, the addition of hormonal medication (“add-back” therapy) for the vasomotor symptoms caused by GnRH analogues appears to have no adverse effect on the myoma reduction [74, 75].
Unfavourable localisation of the myoma, e.g. in the cornual area, is mentioned by some authors as another indication for pre-treatment to prevent perforation .
In view of the high costs and the side effects of GnRH analogues, it seems reasonable to determine indications and to limit administration to this selected group of indications.
myomas with a diameter of 4 cm and above
an unfavourable location in the uterine cavity, e.g. the cornual area
anaemia due to abnormal bleeding
type II myomas
These indications are reinforced when they occur in combination with each other.
Use of distension media and instrumentation
In TCRM with hypotonic distension media there is a consensus about the need to use a system that enables the assessment of the amount of inflow and outflow of the distension medium as a measure of the degree of intravasation in order to prevent fluid overload . Systematic research in this field is lacking. In the meantime, systems have been developed that use bipolar electrical energy, with the advantage of the possibility to use isotonic solutions instead. Although, as far as intravasation is concerned, the safety margins are probably larger, it remains even then advisable to control the fluid load, especially in the case of existing cardiopulmonary risk factors . The consequences of intravasation can be subdivided into volume overload, which is to be expected in every medium in the case of excessive infusion, and a shift in electrolytes that may occur in non-isotonic media. The latter could lead to the so-called “TUR” syndrome, named after the trans-urethral resection in which procedure this entity was first reported .
The disruption of the electrolyte balance through the intravasation of non-isotonic, non-conductive fluids used as distension media can potentially cause serious organ damage. There appears to be a linear correlation between the intravasation of an electrolyte free (non-isotonic) fluid and the occurrence of hyponatraemia: approximately a 1 mmol/l drop in Na concentration per 100 ml of fluid loss. Moreover, with as little as 500 ml of fluid deficit and above, oedema of the brain has been found to be visible on computerised axial tomography (CAT) scan [3, 80, 81].
120–125 mmol/l, discomfort; nausea; headache
110–120 mmol/l, headache; lethargy; confusion
<110 mmol/l, insult; delirium; coma (beware of cardiac rhythm changes in cases of hypokalaemia)
Assuming a mean population value of 140 mmol/l for Na+, a value of 125 mmol/l corresponds to approximately 1,500 ml fluid deficit .
Probably, the determination of the osmolarity is a better measure for the amount of electrolyte shift .
>500 ml - intensification of vigilance and monitoring during the procedure
facultative administration of mannitol 20% 
>1000 ml - aiming at ending the procedure (max. intravasation 1,500 ml)
administration of diuretics
administration of NaCl 2.5% under guidance of electrolyte assessment
In order to be able to determine this deficit in rinsing fluid, it is advisable to use an automatic pump system that continuously visualises flow rate and the amount of inflow and outflow of the distension medium.
Which form of anaesthesia is optimal is not clear from the literature either. On one hand, with regional anaesthesia symptoms the subjective wellbeing of the patient is a sensitive monitoring system (e.g. dyspnoea is an early symptom of intravasation); on the other hand the first symptoms of hyponatraemia become clear more rapidly than with general anaesthesia.
Bipolar energy systems have the great advantage of permitting the use of normal saline solution as the distension medium but are not yet widely used. On the basis of favourable clinical experience and the ongoing developments that are taking place in the leading industries in this area, bipolar systems appear very promising in terms of a wider window of safety and fewer serious complications when intravasation occurs [85, 86]. The ACOG advises the acceptance of a maximum deficit of 2,500 ml saline solution . Results of clinical studies to substantiate this recommendation, however, are not available.
Chances of perforation probably increase accordingly with the decrease in the distance between myoma and serosa. An arbitrary safe margin of 8 mm has been mentioned for this distance in the literature . The smaller this distance is, the more restraint and vigilance has to be maintained, and the surgeon may consider performing the procedure under laparoscopic or ultrasound guidance. In the case of perforation, it is usually advisable to end the procedure and continue at a later stage, unless there is suggestion of a bowel lesion—in that case, laparoscopy and, if there is doubt, even a laparotomy, is recommended [78, 83].
The incidence of infection in hysteroscopic operations is higher than in diagnostic procedures but still very low . In transcervical resection of the endometrium (TCRE), the use of antibiotic prophylaxis has been studied and has not been proven to be meaningful in the prevention of clinically manifested infections, although there was a significant reduction in the incidence of bacteraemia (2% vs 16 %) . In view of the latter somewhat paradoxical finding, it might be argued that a clinical significance could be found in a larger study group.
Whether these data may simply be extrapolated to TCRM cases is questionable, but the smaller wound surfaces in these procedures make it unlikely that the risks will be much greater. In contrast a few case reports of serious, incidental fatal infections have caused some authors to give antibiotic prophylaxis all the same [90, 91].
It may be considered to recommend antibiotic prophylaxis on these grounds and on account of the reduction in bacteraemia until more is clarified about the use of this measure, especially if there are possible plans for further child bearing. This is in concordance with both the aforementioned Dutch guideline and the RCOG guideline no. 5 on menorrhagia, which both also tend to recommend antibiotics in hysteroscopic procedures on account of the suggestive extrapolation from hysterectomy data [29, 92].
Vasoconstrictive agents and other drugs controlling bleeding
Vasoconstrictive agents are said to have a preventive effect on bleeding. For this purpose adrenaline 1:200000 has been advised, but its use has never been adequately evaluated.
Intravenous administration of 500–1,000 mg of tranexamic acid (Cyclokapron) is known to decrease the amount of postoperative bleeding, but, in the literature, very few data can be found on its application in TCRM. The ACOG recommends possible intracavitary administration of this drug, but without further reference .
In order to prevent postoperative bleeding after TCRM a 30 ml Foley catheter may be used on indication, or a specially designed intra-uterine balloon stent (Cook) for 6 h to 12 h after the procedure as a tamponade device for the intra-uterine wound bed. In most cases, however, the bleeding will come to an acceptable level within minutes after the procedure, which period therefore can best be awaited before any measures are taken.
The necessary expertise for the treatment of submucous myomas is described in the Goals for the basic training package in the education of the Gynaecologist as these have been formulated by the Educational Council of the Dutch Society of Obstetrics and Gynaecology. From the recommendations in this report the TCRM of small type 0 and I myomas can be considered to belong to the basic training package of each gynaecologist, but the treatment of type II and/or large myomas is to be restricted to gynaecologists with additional training and experience.
In the case of submucous myomas, transvaginal ultrasound is the initial imaging technique of choice (B).
For a more accurate diagnostic visualisation, especially if this fails in conventional ultrasound and as an adequate preparation for operative treatment, the addition of physiological saline solution as a contrast medium (SIS: saline infusion sonohysterography) is recommended (B).
Diagnostic hysteroscopy is almost equally effective for this purpose (B) and, moreover, has the advantage of ample evidence to be a good test for the simple detection and exclusion of intra-uterine abnormality (B).
MRI is a less readily available alternative, with a reliability that, specifically for submucous myomas, is superior to that of SIS and hysteroscopy and can be used preoperatively on indication of certain surgical procedures (B).
Submucous myomas with a diameter of 4 cm and less should be removed hysteroscopically (B).
In the case of larger fibroids, preoperative reduction is possible with GnRH analogues (A2), and, in the case of additional risk factors (subfertility, unfavourable location, anaemia, type II), pre-treatment with these drugs should be taken into consideration (B).
For multiple myomas, patients should be counselled about an increased recurrence risk, and alternative therapy, such as hysterectomy, can be taken into consideration (C). If there are child bearing intentions, restraint is mandatory to a degree that is in proportion to the degree of intramural extent (which, by the way, in addition, decreases the strength of the indication accordingly) (B).
When a hypotonic distension medium is used in myoma removal, an automated pump system is recommended that carefully monitors the difference between inflow and outflow, aiming at limitation of the deficit up to 1,000 ml (at any rate, no more than 1,500 ml) (D). Possible additional measures to be taken in case of an increasing deficit of distension medium include the use of mannitol, physiological saline solution and/or diuretics (C).
Antibiotic prophylaxis is recommended (C).
In the case of serious post-operative blood loss, intra-uterine tamponade with a balloon catheter may be considered (D).
Hysteroscopic surgery under laparoscopic or ultrasound guidance is rarely necessary but may be taken into consideration in specific indications (D).
Surgery for abnormalities that are not included in the basic training package according to the aforementioned Goals for the education of gynaecologists ought to be performed by a gynaecologist with additional training and experience (D).
based on meta-analyses that contain at least several randomised studies of level A2, and in which the results of the individual studies are consistent.
of good quality and with sufficient volume and consistency.
based on randomised controlled trials of lesser quality or insufficient volume or other comparative studies (non-randomised; cohort studies, case–control studies)
based on non-comparative studies
based on expert opinion and respected authorities
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