Postmenopausal adnexal torsion: rare case report

Introduction

Adnexal torsion is a rare emergency condition occurring at any age [1]. Adnexal torsion occurs in 2-15% of women who have had previous surgical treatment for adnexal masses or cysts [1].
Most of the adnexal and/or ovarian torsions occur at reproductive age and are less common in postmenopausal age [1, 2].
This report represents a rare case of an adnexal torsion in a postmenopausal woman, to highlight that adnexal torsion can occur at any age and that the presence of ovarian mass or cyst predispose to adnexal torsion at any age.

Case report

A 49-year-old menopausal woman for the last two years presented to the Emergency Department of Ahmadi Hospital, Kuwait Oil Company (KOC) with abdominal pain. She had a palpable pelvi-abdominal mass and abdominal tenderness on examination.
Departmental ultrasound showed a large multilocular right adnexal cyst (15 cm × 12 cm) with numerous thin septations, and the locules contained fluid of different echogenicity (mucin). Departmental ultrasound followed by magnetic resonance image (MRI) showed a large multilocular right adnexal cyst (15 cm × 12 cm) containing fluid with variable signal intensities on both T1 and T2 sequences (stained glass appearance), most probably mucinous cystadenoma (Fig. 1).
The studied woman signed an informed consent form and agreed to exploratory laparotomy and adnexectomy. After the pre-operative investigations, which were done according to the hospital protocol, including CA-125 (26 IU/ml) and anaesthesia consultation, she was booked for laparotomy.
At laparotomy an ovarian cyst originating from the right ovary was found with evidence of torsion of the infundibulopelvic and the utero-ovarian ligaments (adnexal torsion) (Fig. 2).
The right adnexa including the right ovary containing the ovarian cyst and the right fallopian tube was excised (adnexectomy) (Fig. 3).
The excised right adnexa including the ovarian cyst, which measured 15 cm × 12 cm, was sent for histological examination (Fig. 4).
The histological examination of the excised adnexa showed a multilocular cyst with variable size locules lined by flat columnar and low cuboidal cells overlying fibrous connective tissue stroma of spindle cells confirming the diagnosis of mucinous cystadenoma of the ovary.
The patient was discharged home after an uneventful post-operative hospital stay on the fifth post-operative day. Written consent from the studied woman and departmental approval were taken to publish the studied woman’s data as a case report.

Discussion

Mucinous cystadenoma of the ovary is a benign tumour from the surface epithelium of the ovary [3] and constitutes 15% of all ovarian tumours – usually presenting as a large multilocular cyst with smooth outer surface [3].
About 80% of the ovarian mucinous tumours are benign and usually present in reproductive age [1], rarely before puberty or after menopause [3].
The presence of large mucinous cystadenoma in the ovary (cyst or mass > 5 cm) predispose to adnexal and/or ovarian torsion [1].
The most common symptoms of adnexal and/or ovarian torsion are acute abdominal pain, nausea, and vomiting [4, 5].
Cancer antigen-125 (CA-125) is one of the tumour markers that should be tested to exclude malignancy or endometrioma in cases of suspected adnexal and/or ovarian masses [1].
Ultrasound is the first diagnostic tool in cases of suspected adnexal masses [1]. Magnetic resonance imaging (MRI) is helpful in diagnosing adnexal/ovarian torsion. In addition, the MRI can demonstrate more details regarding the components of the adnexal/ovarian mass [6].
Despite the development of several ultrasound models for the diagnosis of adnexal masses, the early diagnosis of ovarian cancers is still difficult. Moreover, identifying genetic risk alleles (germline BRCA1 and BRCA2 mutations) for ovarian cancers has a significant impact on disease prevention strategies [7].
Froyman and Timmerman concluded that the International Ovarian Tumour Analysis (IOTA) Assessment of Different NEoplasias in the adneXa (ADNEX) model is clinically relevant and can give the predicted malignancy risk for different subtypes of adnexal masses [8].
Chen et al. concluded that the IOTA-ADNEX model showed good to excellent performance in distinguishing between benign and malignant adnexal masses in a Chinese setting [9]. In addition, Nowak et al. concluded that IOTA performance was highly satisfactory and similar to that of CA-125 in predication of malignancy risk for adnexal masses [10]. Both the IOTA model and CA-125 are complementary and can be used to differentiate between malignant and benign ovarian masses, although other clinical variables may also be important [10].
Once adnexal/ovarian torsion is suspected, surgery is the main treatment option [1]. In recent years, the treatment of adnexal/ovarian torsion has been evaluated, and ovarian conservative surgery including cystectomy and/or detorsion is recommended rather than salpingo-oophorectomy or adnexectomy [11, 12].
The studied woman presented with abdominal pain, nausea, vomiting, and abdominal tenderness, diagnosed as adnexal/ovarian torsion due to right-sided ovarian mucinous cystadenoma based on the ultrasound and MRI findings. The preoperative CA-125 was 26 IU/ml. She was managed by exploratory laparotomy and right adnexectomy without ovarian conservative surgery based on her age (49 years old and menopausal for the last two years).
This report represents a rare case of adnexal torsion in postmenopausal woman to highlight that adnexal torsion can occur at any age and that the presence of ovarian mass or cyst predispose to adnexal torsion at any age.

Conclusions

The diagnosis of adnexal/ovarian torsion is challenging. Pelvic ultrasonography is the first diagnostic tool for diagnosis of adnexal mass or cyst, which predispose to adnexal torsion, while MRI is a complementary diagnostic tool to the pelvic ultrasound. Once adnexal/ovarian torsion is suspected, surgery is the main treatment line using conservative ovarian surgery (ovarian cystectomy and/or detorsion) or radical ovarian surgery (oophorectomy or adnexectomy) according to the patient’s age and fertility potential.

Acknowledgments

Authors are grateful to the studied woman who agreed for us to publish her data as a case report.

Disclosure

The authors report no conflict of interest.

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