Metachronous occurrence of two different histological subtypes of endometriosis-related neoplasms

Case Series and a Literature Review: Two Ovarian Clear Cell Carcinoma Cases with Recurrent Endometriosis

Introduction

Endometriosis-associated ovarian cancer (EAOC) is rare, occurring approximately in 1% of women with ovarian endometriosis. The main histological types are endometrioid adenocarcinoma and clear cell carcinoma (CCC), with the latter being the least common.

Case Presentation

In our hospital, we recently summarized two patients with ovarian clear cell carcinoma with similar characteristics. They all had endometriosis for a long time and had undergone ovarian cyst removal due to a chocolate cyst. Unfortunately, the cyst recurred after surgery, and the histological diagnosis was clear cell carcinoma. In case 1, the expression of P53 was found in the tumor by regular examination, and the stage was IIB. In Case 2, we found it in intraoperative freezing; the stage was IA. Case 1 has been treated with the TP regimen six times, and the survival period has reached one year. Case 2 had a survival period of 6 years after completing six TP regimen treatments. Clinicians should pay attention to patients with a long history of endometriosis and postoperative recurrence of ovarian cysts accompanied by serum CA-125 of more than 200U/mL. Imaging examination has a good prospect in diagnosing malignant transformation of endometriosis, especially PET-CT.

Conclusion

This case report highlights the risk factors related to the formation of ovarian clear cell carcinoma and suggests that the follow-up of patients with ovarian endometriosis is essential because of its recurrence characteristics. Radical surgery and postoperative platinum-containing chemotherapy are the primary treatment methods at present.

Ovarian seromucinous tumors: clinicopathological features of 10 cases with a detailed review of the literature

Background

The 2014 WHO Classification of ovarian neoplasms introduced a new entity of seromucinous tumors associated with endometriosis. These tumors encompassed a spectrum from benign to malignant and included seromucinous cystadenoma/ cystadenofibroma, seromucinous borderline tumor/atypical proliferative seromucinous tumor and seromucinous carcinoma. However, the 2020 WHO Classification of Female Genital Tumours removed seromucinous carcinomas as a distinct entity and recategorized them as Endometrioid carcinomas with mucinous differentiation. Here we describe clinico-morphologic features of seromucinous tumors recategorizing cases originally diagnosed as seromucinous carcinoma in light of 2020 WHO classification and present detailed review of literature.

Methods

Slides of seromucinous tumors were reviewed. Special emphasis was given to evaluation of stromal invasion. Follow-up was obtained.

Results

Ten cases were diagnosed. Mean age was 40 years. Four cases were bilateral. Mean size was 19 cm. Grossly; luminal papillary projections were seen in 6 cases. Tumors demonstrated a papillary architecture with papillae lined by stratified seromucinous epithelium showing nuclear atypia. Stromal invasion was seen in 4 cases. Six cases were reported as borderline seromucinous tumors and 4 cases originally diagnosed as seromucinous carcinoma were recategorized as endometrioid carcinoma with mucinous differentiation on review. Endometriosis was seen in 4 cases. CK7, PAX8 and ER were positive in 7/7 cases. Two cases showed extra-ovarian involvement. Follow up was available in 7 cases. Six patients were alive and well at follow up ranging from 8 to 46 months. Six patients received chemotherapy postoperatively. One patient with carcinoma died of disease 18 months postoperatively.

Conclusion

In our series, 4 cases were originally diagnosed as seromucinous carcinomas. However, these were recategorized in light of the 2020 WHO Classification of Female Genital tumors as endometrioid carcinomas with mucinous differentiation. Six cases were diagnosed as seromucinous borderline tumors. Thus, majority of cases were borderline in agreement with published literature.

Pelvic seromucinous borderline tumor 26 years after ovarian seromucinous borderline tumor managed with post-treatment estrogen replacement therapy

•A 56-year-old woman developed two seromucinous borderline tumors 26 years apart.•The second cyst was diagnosed as a seromucinous borderline tumor associated with pelvic endometriosis.•The first ovarian cancer was re-diagnosed as an ovarian seromucinous borderline tumor after a pathological slide review.•Seromucinous borderline tumors can re-occur several years after post-treatment estrogen replacement therapy.•Post-treatment estrogen replacement therapy for seromucinous borderline tumors should be provided carefully.

Primary endometrioid carcinoma of the uterosacral ligament arising from deep infiltrating endometriosis 6 years after bilateral salpingo-oophorectomy due to atypical proliferative endometrioid tumor of the ovary: a rare case report

BACKGROUND

Endometriosis can potentially lead to the development of a malignant tumor. Most malignant tumors arising from the endometriosis originate from the ovarian endometrioma, whereas those arising from extragonadal lesions are rare. We report a rare case of endometrioid carcinoma that developed from deep infiltrating endometriosis in the uterosacral ligament 6 years after treatment for atypical proliferative endometrioid tumor of the ovary in a 48-year-old woman.

CASE PRESENTATION

Six years ago, the patient underwent laparoscopic bilateral salpingo-oophorectomy for her right ovarian tumor with atypical proliferative (borderline) endometrioid tumor accompanied by ovarian endometrioma. The solid tumor in the cul-de-sac was detected during follow-up using magnetic resonance imaging. Positron emission tomography/computed tomography revealed an abnormal accumulation of ¹⁸F-fluorodeoxyglucose at the tumor site. Thus, tumor recurrence with borderline malignancy was suspected. The patient underwent diagnostic laparoscopy followed by hysterectomy and partial omentectomy. Retroperitoneal pelvic lymphadenectomy and para-aortic lymphadenectomy were also performed. The cul-de-sac tumor at the left uterosacral ligament was microscopically diagnosed as invasive endometrioid carcinoma arising from deep infiltrating endometriosis. The final diagnosis was primary stage IIB peritoneal carcinoma. The patient received six courses of monthly paclitaxel and carboplatin as adjuvant chemotherapy. The patient showed no evidence of recurrence for 2 years after the treatments.

CONCLUSION

This study reports a rare case of metachronous endometriosis-related malignancy that developed 6 years after treatment for borderline ovarian tumor. If endometriosis lesions remain after bilateral salpingo-oophorectomy, the physician should keep the malignant nature of endometriosis in mind.