# Primary Ovarian Poorly Differentiated Adenocarcinoma with Signet-Ring Cells: A Case Report and Literature Review

## TL;DR

This paper reports a rare case of aggressive ovarian cancer with signet-ring cells, emphasizing the difficulty in diagnosing and treating this condition.

## Contribution

The paper presents a unique case of non-mucinous primary ovarian signet-ring cell carcinoma and reviews the literature on this rare condition.

## Key findings

- The patient had primary ovarian poorly differentiated adenocarcinoma with signet-ring cells, not mucinous carcinoma.
- Despite treatment, the disease recurred and led to the patient's death within 18 months.
- The case highlights the aggressive nature and diagnostic challenges of non-mucinous POSRCC.

## Abstract

Background: Primary ovarian signet-ring cell carcinoma (POSRCC) is exceedingly rare. Most previously reported cases have involved primary ovarian mucinous neoplasms containing signet-ring cells. Methods: We report a unique case of advanced primary ovarian adenocarcinoma with a signet-ring cell component, accompanied by features inconsistent with typical mucinous morphology, which distinguished it from most previously documented cases. A review of the literature is also provided. Results: A 57-year-old woman presented with abdominal pain. Imaging revealed a 10 cm pelvic mass. Surgical exploration and pathological examination revealed poorly differentiated adenocarcinoma with focal signet-ring cell features in both ovaries. Extensive preoperative and postoperative evaluation revealed no evidence of an alternative primary tumor. The tumor did not meet diagnostic criteria for mucinous carcinoma. Therefore, the final diagnosis was primary ovarian poorly differentiated adenocarcinoma with a focal signet-ring cell component, FIGO stage IIIC. The patient received six cycles of adjuvant paclitaxel and carboplatin, followed by four cycles of single-agent bevacizumab for maintenance therapy. Despite treatment, disease recurred eight months after surgery, and the patient died of disease progression 18 months postoperatively. Conclusions: This case highlights the aggressive behavior of non-mucinous POSRCC and underscores the diagnostic challenge in distinguishing primary from metastatic ovarian signet-ring cell carcinoma. Awareness of this rare entity is crucial for accurate diagnosis and appropriate management.