Abstract
A 64-year-old woman was found to have a submucosal mass 6 cm in diameter in the gastric body by upper gastrointestinal tract radiography. She was referred to our hospital for further examination and treatment. Endoscopic examination showed a submucosal tumor with focal ulceration in the gastric body. Abdominal computed tomography revealed thickening of the gastric wall, bilateral ovarian mass without enlargement, peritoneal metastasis, and a mass 4 cm in diameter in the Douglas pouch. She underwent endosonography-guided fine needle aspiration and was diagnosed with primary peritoneal carcinoma and gastric metastasis. After neoadjuvant chemotherapy with paclitaxel and carboplatin, she underwent debulking surgery.