Peutz–Jeghers syndrome complicated by gastric‐type cervical mucinous carcinoma and primary peritoneal carcinoma

A 45‐year‐old multiparous woman with a STK11 mutation and a history of Peutz–Jeghers syndrome underwent radical hysterectomy and bilateral salpingo‐oophorectomy for a gastric‐type cervical mucinous carcinoma. Four and a half years later, blood tests revealed elevations in CEA and CA125 tumor marker levels, and computed tomography showed multiple calcifications in the peritoneum. Peritoneal dissemination was suspected, and a laparoscopic biopsy was performed. Histopathology showed a high‐grade serous carcinoma, and the patient was diagnosed with a metachronous stage IIIC primary peritoneal carcinoma. She had no BRCA1/2 mutation. After chemotherapy with docetaxel, carboplatin, and bevacizumab, she achieved complete remission.