Absence of unilateral adnexa associated with asymptomatic adnexal torsion and autoamputation
© Springer-Verlag Berlin / Heidelberg 2005
Received: 14 September 2004
Accepted: 20 December 2004
Published: 12 February 2005
We present the case of a patient who had a pelvic mobile mass and unilateral absence of unilateral ovary and ipsilateral partial fallopian tube, which may be associated with asymptomatic adnexal torsion. She had had no previous abdominal operations and no history of acute abdominal pain, nausea or vomiting. There are two possible reasons for unilateral absence of adnexa: one is adnexal torsion and the other is congenital malformation.
Unilateral absence of an ovary and/or uterine tube is an extremely rare finding, occurring in only one in 11,241 women . There are two possible aetiologies: the absence may be congenital or it may be secondary to adnexal torsion . A case of unilateral absence of adnexa and presence of a mobile calcified mass discovered incidentally during laparoscopy is presented. Only three other cases of absence of adnexa in conjunction with a free-floating mass have been reported so far in the literature.
We describe the unilateral absence of the ovary and partial absence of the ipsilateral fallopian tube. We did not find any other anatomical malformation in this patient. Absence of one or both uterine tubes and ovaries is a finding that has rarely been described. Mylonas et al.  recently reported three cases of unilateral ovarian agenesis and reviewed the literature. In total, 13 studies and 19 cases were reported . There are two possible aetiologies. The first involves an asymptomatic torsion of one or both adnexa during adult life or childhood, or even before birth . Alternatively, the absence may be congenital, due to either a defect in the development of the entire mullerian and mesonephric systems on one side, or to a defect localized to the region of the genital ridge and the caudal part of the mullerian duct . Partial or total unilateral defects of a paramesonephric duct are more common than aplasia of both ducts . However, because of the close embryologic association between the genital and urinary tracts, one would expect to find a unicornuate uterus and one ectopic or rudimentary kidney . So, in the case of isolated absence of a tube or ovary, the hypothesis of a congenital malformation is quite weak. However, some authors have suggested that an inadequate blood supply during the descent into the pelvis of the caudal part of the paramesonephric duct might feasibly lead to incomplete tube development .
The lack of any other anatomic malformation, and the presence of a mobile mass in the pelvis, suggested that in this case the possible aetiopathogenic cause of the absence of a unilateral adnexa was adnexial torsion. However, the patient did not recall a past history of significant acute abdominal pain, nausea and vomiting, which would suggest an adnexal torsion. It was suggested that torsion could probably have taken place through foetal life  or asymptomatic adnexal torsion leading to infarction and autoamputation . A review of the literature revealed three cases of absence of one adnexa in conjunction with a free-floating mass that could be identified as an ovary [8–10]. However, the hypothesis of a congenital defect cannot be excluded.
The aetiology of absent adnexa in most cases is uncertain. Our case supports the adnexal torsion hypothesis.
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