Endometrial cancer following endometrial resection
© Springer-Verlag 2007
Received: 25 October 2006
Accepted: 5 April 2007
Published: 8 May 2007
Endometrial ablation has emerged as a viable alternative to hysterectomy in the treatment of medically intractable dysfunctional uterine bleeding. However, this procedure cannot guarantee complete removal of the entire endometrium. Cases of endometrial cancer after endometrial ablation have been reported in the literature. We reviewed the cases of patients who underwent hysteroscopic endometrial ablation by endometrial resection for abnormal uterine bleeding from 1994 to 2005 at the Department of Obstetrics and Gynecology, Polyclinique, Clermont-Ferrand University. Of the 3769 patients having had hysteroresections, four developed endometrial cancer after complete endometrial ablation (1.06 out of 1000). All four of these patients showed histological evidence of endometrial polyps at endometrial resection, and all of them presented risk factors for endometrial carcinoma, such as obesity and/or arterial hypertension. Endometrial cancer after hysteroscopic endometrial ablation is a rare but possible occurrence, even a long time after the operation. Close monitoring of patients who have undergone endometrial ablation for endometrial polyps and who present risk factors, such as obesity or hypertension, even after apparent total ablation of the endometrium is strongly recommended, independently of the presence of abnormal bleeding that can represent a late symptom of advanced endometrial cancer.
Endometrial ablation has emerged as a viable alternative to hysterectomy in the treatment of medically intractable dysfunctional uterine bleeding for women who have no desire to preserve their fertility or for the treatment of postmenopausal bleeding associated with benign endometrial or myometrial pathology [1–12]. The principle of the technique is to remove the whole thickness of the endometrium and some of the superficial myometrium to ensure complete removal of the endometrial basal glands, using a monopolar or bipolar resecting loop or coagulating electrode (“roller-ball”). However, despite the theoretically complete ablation of the endometrium, cases of endometrial cancer (EC) after endometrial ablation have been described in the literature [13–22].
To study this problem, we have reviewed the cases of patients who underwent hysteroscopic endometrial ablation by endometrial resection for abnormal uterine bleeding from 1994 to 2005 at the Department of Obstetrics and Gynecology, University Hospital of Clermont-Ferrand (Auvergne region, France).
Subjects and methods
Data on the four patients who developed EC after hysteroscopic endometrial ablation by endometrial resection
Number of case
Age of menopause (years)
Age at cancer diagnosis (years)
Interval from endometrial ablation to carcinoma diagnosis (years)
Yes, at hysteroscopy and after hysteroscopy
Yes, at hysteroscopy, stoped after hysteroscopy
Yes, after hysteroscopy
A 63-year-old postmenopausal woman, gravida 2, para 1, one cesarean section, presented for metrorrhagia in March 1995. She was had been taking hormone replacement therapy (HRT) in continuous regimen with Oestrogel (estradiol) + Utrogestan (natural progesterone) for 8 years. The patient had presented several episodes of spotting in 1992, 1993 and 1994 and had had ultrasonographic imaging checks with no associated treatment. Her past medical history included treated arterial hypertension (AH). The patient’s body mass index (BMI) was 21.
In March 1995 the ultrasonography showed an endometrium of 8 mm with the suspicion of endometrial polyp and sub-mucosal myoma. In April 1995 the patient underwent hysteroscopic resection of an endometrial polyp and sub-mucosal myoma by monopolar resecting loop followed by complete endometrial ablation with monopolar resecting loop, even though the endometrium appeared normal at hysteroscopy. The histopathology was consistent with an endometrial fibro-glandular polyp and leiomyoma without any signs of malignancy and endometrium without anything out of the ordinary.
Following the endometrial ablation she continued the same HRT for 10 years up to 2005 when she presented again for metrorrhagia. Hysteroscopy was performed in August 2005 and showed the presence of an endometrial polyp and diffuse endometrial hypertrophy. Histopathological results after curettage revealed well-differentiated EC with clear cells.
In October 2005 she underwent laparoscopic total hysterectomy, bilateral salpingoophorectomy and bilateral pelvic lymphadenectomy followed by external radiotherapy. The final histological diagnosis was: moderately to poorly differentiated endometrioid adenocarcinoma with 10% of clear cells infiltrating 50% of the myometrium without embols. FIGO stage: IB, GII-III.
A 60-year-old postmenopausal woman, gravida 0, presented in October 1997 for metrorrhagia that had started 8 months before. She was not under HRT. She presented an episode of spotting in 1992 and underwent curettage. The histopathological result of the material obtained was benign. The patient’s medical history included AH and obesity (BMI: 33).
In September 1997 the ultrasonography showed an endometrium of 10 mm. In October 1997 an hysteroscopy revealed two voluminous endometrial polyps, one of which showed a suspicious area near the pedicle. Selective resection of the polyps by monopolar resecting loop was performed, followed by endometrial complete curettage. The histopathology was consistent with glandulo-cystic polyps without any malignancy, and atrophic endometrium.
In August 2005 she presented again for severe metrorrhagia. She underwent magnetic resonance imaging (MRI) that revealed the presence of a heterogeneous endometrial lesion throughout the cavity which had infiltrated the myometrium. The hysteroscopy performed in August 2005 showed the presence of two suspicious polypous lesions. The histopathological result of curettage showed moderately differentiated endometrioid adenocarcinoma developed in the polypoid endometrium.
In September 2005 she underwent laparotomy for total hysterectomy and bilateral salpingoophorectomy. A lymphadenectomy was not performed due to technical difficulties (obesity). The patient also had external radiotherapy. The final diagnosis was well-differentiated endometrioid adenocarcinoma infiltrating more than 50% of the myometrium. FIGO stage: IC, GI.
A 53-year-old postmenopausal woman, gravida 3, para 2, one abortion, presented for metrorrhagia in January 2000. She had been under combined HRT (Climene) for 3 years. The patient’s past medical history included medically treated AH, hypercholesterolemia and obesity (BMI: 39). A hysterography was performed that revealed the presence of two endometrial polyps.
In April 2000 she underwent resection of the polyps followed by complete resection of the endometrium by monopolar resecting loop followed by “roller-ball” coagulation of the whole endometrial cavity. The histopathology was consistent with glandulo-cystic polyps without any signs of malignancy. Subtle adenomyosis was also observed.
In December 2004 she presented again for metrorrhagia. HRT was stopped. Hysterography showed suspicious intrauterine images. In March 2005 another hysteroscopy was carried out, when a non-suspicious endometrial hyperplasia was resected by bipolar loop (Versapoint, Gynecare). The pathological report described well-differentiated endometrioid intra-epithelial adenocarcinoma.
In April 2005 she underwent laparoscopic total hysterectomy, bilateral salpingoophorectomy with bilateral pelvic lymphadenectomy. Then she had brachitherapy. The final diagnosis was well-differentiated adenocarcinoma-adenoacanthoma without myometrial invasion. FIGO stage: IA, GI.
A 56-year-old woman, gravida 2, para 2, presented in September 1993 for metrorrhagia persisting for 7 months. She was not under HRT as she was still regularly menstruating. The patient’s medical history included obesity (BMI: 34) and hypothyroidism. An hysterography was performed that resulted in the suspected presence of endometrial polyps and adenomyosis.
In September 1993 an hysteroscopy showed a hypotrophic endometrium with areas of hyperplasia. The uterine fundus had a petecchial appearance, suggestive of the presence of adenomyosis. Complete resection of the endometrium by monopolar resecting loop was carried out. The pathology result was consistent with simple polypoid hyperplasia without any malignancy.
In October 1994 she started HRT with Oestrogel (estradiol) 25 days/month + Luteran 5 (chlormadinone) 12 days/month. In June 1996 she underwent an uterine ultrasonographic imaging examination that gave normal results. In January 1999 she presented again for metrorrhagia. HRT was stopped. An ultrasonography in May 1999 was repeated and showed a 15-mm endometrium. An endometrial biopsy revealed a well-differentiated endometrial adenocarcinoma.
In July 1999 she underwent laparoscopic total hysterectomy, bilateral salpingoophorectomy with pelvic bilateral lymphadenectomy, this was followed by brachytherapy. The final diagnosis was well-differentiated endometrioid adenocarcinoma infiltrating less than 50% of the myometrium. FIGO stage: IB, GI.
Clinical and technical aspects of the four cases
Number of case
Endometrial ablation method
Circumstances of cancer diagnosis
Histology at hysteroscopy
Histology of cancer, stage and grade
Treatment for pathologic diagnosis
Polyp resection + myoma resection + complete endometrial resection
Recurrent bleeding under HRT
Fibro glandular polyp and myoma
Adeno carcinoma with clear cells 1B, Grade II-III
TH + BSO + lymphadenectomy by laparoscopy +Rx therapy
Selective resection of polyps + curettage
Two glandulo-cystic polyps + endometrial atrophy
Adeno carcinoma 1C, Grade I
TH + BSO + lymphadenectomy by laparotomy + Rx therapy
Polyp resection + complete endometrial resection + "roller-ball" endometrial coagulation
Three glandulo-cystic polyps + adenomyosis
Adeno acanthoma 1A, Grade I
TH+BSO + lymphadenectomy by laparoscopy + Rx therapy
Complete endometrial resection
Recurrent bleeding under HRT
Simple polypoid hyperplasia
Adeno carcinoma 1B, Grade I
TH+BSO + lymphadenectomy by laparoscopy + Rx therapy
EC after endometrial ablation is a rare but possible occurrence, as described in the literature in a number of case reports [13–22]. The exact rate of EC after endometrial ablation is still unknown, but the most common symptom is recurrent abnormal bleeding and the state of cancer diagnosed is advanced in many of the cases described [14, 16–20].
The lifetime risk of EC in the general population is considered to be 2–3% , and the prevalence to be 1 in 1000. In our study, four patients of 3769 reviewed developed EC after complete endometrial ablation (1.06 out of 1000). We are aware that the rate presented is probably biased by the fact that we did not check whether the patients who underwent endometrial resection in Auvergne have been treated for EC outside the region. In addition, even those studies using a questionnaire and cancer registries were unable to reach the completeness of the database . However, our goal was not to establish a rate but to determine whether the patents who developed EC after endometrial resection presented any risk factors. Nevertheless, our data give an approximation of the incidence for EC after complete endometrial resection and should serve as a guide for patient counseling on the risks of hysteroscopic resection and the necessity of specific follow-up. The occurrence of EC after endometrial ablation also raises the question whether this finding can be correlated to the technique of endometrial ablation, the pathology itself or other factors.
Endometrial ablation is widely performed as an alternative to hysterectomy in the treatment of uterine bleeding associated with benign endometrial or myometrial pathology [1–12]. Serious short-term and long-term complications of endometrial ablation have been described. These include uterine perforation, fluid overload, fatal air embolism and thermal and mechanical damage to the bowel, bladder, ureter, pelvic blood vessels and hematometra [11, 24, 25]. Patients who have undergone endometrial ablation can also be at risk for pregnancy as residual functional islands of endometrial tissue can persist following the procedure. Even with complete amenorrhea, the risk of pregnancy is not absent [26–28]. Several studies have shown the persistence of endometrium even after complete endometrial resection, so it is conceivable that some woman may develop adenocarcinoma [1, 5, 29–31].
Khastgir et al.  studied 12 women with continuing menstrual problems after endometrial ablation by means of transvaginal ultrasound imaging and reported unchanged endometrium in four women and minimal residual endometrium in five women. Turnbull et al. , using magnetic resonance imaging, described the presence of residual endometrium after endometrial resection after a mean interval of 16 months in all except for three amenorrhoeic women, with similar mean endometrial volume present in menstruating and amenorrhoeic groups. Histology of the subsequent hysterectomy specimens confirmed the presence of endometrium and adenomyosis and revealed extensive fibrosis and a necrotic granulomatous reaction.
These nests of tissue missed during hysteroscopic endometrial ablation might later develop into a blind pocket of EC while at the same time synechiae and superficial scar formation could delay bleeding and the subsequent diagnosis of carcinoma. It is also conceivable that some women may develop adenocarcinoma in deep remains of adenomyosis not adequately destroyed by superficial ablation . In our study, adenomyosis was found only in one patient of the four after endometrial resection.
In all of the cases described in the literature except two [13–22], the endometrial ablation was performed by roller-ball coagulation. In our study, complete endometrial ablation by resecting loop was performed in three of the four cases (one of these three cases had endometrial resection by monopolar resecting loop followed by monopolar “roller-ball” coagulation of the uterine cavity), while in the remaining one case complete endometrial polyps resection was performed by resecting loop followed by complete curettage of the uterine cavity. This finding emphasizes the fact that the occurrence of EC after endometrial ablation is related not only to the technique chosen but also to other factors.
All four patients of our study showed histological evidence of endometrial polyps at endometrial resection, and two of these later presented with cancer that had developed in endometrial polyps. Endometrial polyps are common pathological lesions of the uterine corpus and are usually found in perimenopausal woman [32, 33]. Abnormal uterine bleeding is frequently the presenting symptom, but polyps are often asymptomatic and found during routine ultrasound or infertility investigations . Polyps are in general benign growths, although malignancy confined to a polyp has also been identified [35–37]. Polyps have also been described to be associated with premalignant changes of the endometrium, but their role as precursors for endometrial carcinoma has not been established [36–40]. In all four of the cases we describe here, the histopathology within the polyps treated during the resection did not revealed any premalignant or malignant changes.
According to the literature, the development of endometrial polyps and of endometrial cancer share the same risk factors. Reslova et al.  showed that AH associated with obesity appears to be an important factor, which may play a role in the pathogenesis of polyps. The correlation between overweight, body fat and higher levels of estrogen have been described in other studies . Savelli et al.  found that out of a panel of clinical characteristics, only patient age, menopausal status and AH seemed to be statistically associated with premalignant and malignant polyps. It has also been reported that endometrial polyps are characterized by aberrations of specific chromosome regions that probably involve genes related to the proliferative process [42–44].
AH is an well-established risk factor for female hormone-related cancers (such as adenocarcinoma of the endometrium) [45–52]. Most studies that address this question have found that the risk increases with the duration of the hypertension, particularly when diagnosed before the age of 50 years [51, 52]. The high BMI and hypertension appear to have a synergistic effect on the risk of endometrial cancer and produce an appreciably elevated risk (almost five-fold) in women exposed to both factors .
All of the patients in our group presented at least one of these risk factors: one patient presented only with obesity, one presented only with AH and two presented with both obesity and AH. Even if all of the polyps were to be completely removed during the hysteroscopy, these risk factors persist after surgery. The persistence of risk factors shared with endometrial cancer exposed these patients to a major global risk of developing an endometrial cancer even a long time after the hysteroresection (mean time in our study: 7 years, minimum: 5 years, maximum: 10 years).
The long delay between endometrial ablation and the diagnosis of endometrial cancer in our study, together with the lack of early occurrence of endometrial cancer after the surgical procedure, confirmed the diagnostic value of hysteroresection followed by pathological examination. No potentially malignant lesions were missed.
This study and the review of the literature show that endometrial cancer after endometrial ablation is a rare but possible occurrence, whether the technique is performed by “roller-ball” coagulation or by resecting loop. The patients with endometrial polyps at resection may present a higher risk for developing endometrial cancer. The occurrence of endometrial cancer may come a long time after endometrial ablation, and the recurrent bleeding may become evident when the cancer stage is already advanced. Even when hysteroresection appears to be complete from the surgical point of view, the procedure cannot guarantee complete removal of the entire endometrium as some endometrial pockets are always left in the cavity. The induction of scars and synechia may mask both physiological and pathological bleeding. Therefore, patients with amenorrhea or hypomenorrhea who have undergone hysteroresection due to endometrial polyps, even after complete ablation of the polyps and apparent total removal of the endometrium, must be considered at higher risk of development of endometrial cancer than the general population, especially in the presence of the additional factors of hypertension and obesity and in the case of associated HRT. For these reasons we suggest that the follow-up after endometrial resection of the patients with these risk factors must include systematic annual ultrasonographic checks. Should the ultrasonographic results be suspicious, hysteroscopy is strongly recommended. If hysteroscopy is difficult to perform due to intrauterine adhesions, hysterectomy may be recommended.
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