• Seito Shimizu, Hitoshi Hara, Yasuhide Muto, Tomoki Kido, and Ryohei Miyata.
• Department of Surgery, Social Welfare Organization Saiseikai Imperial Gift Foundation Inc., Saiseikai Kazo Hospital, Kazo, Japan.
• Medicine (Baltimore). 2024 Mar 29; 103 (13): e37652e37652.

BackgroundGastritis cystica profunda (GCP), commonly observed in remnant gastric anastomosis, is associated with developing gastric cancer.CaseThis case report describes a patient with GCP in a previously unoperated stomach that mimicked a pyloric submucosal tumor and caused anorexia, which is rare in clinical practice.Patient ConcernsA 72-year-old woman presented with loss of appetite and weight.DiagnosesGastroscopy detected a 20 mm diameter submucosal tumor near the pylorus. Computed tomography and magnetic resonance imaging identified a cystic lesion, unlike a usual submucosal tumor in the stomach. The diagnosis was difficult, even with endoscopic ultrasound-guided fine-needle aspiration.InterventionsSurgery was performed for diagnosis and treatment. The lesion was resected using a submucosal dissection technique after an incision of the gastric wall during open laparotomy. Histopathological examination confirmed the diagnosis of GCP and revealed no dysplasia or cancer.OutcomesAnorexia resolved after the surgery. Residual or recurrent lesions were not detected during follow-up examinations performed 1 year after surgery.LessonsGCP occurring in a previously unoperated stomach as a macroscopic lesion like a submucosal tumor causing some symptoms is rare. GCP is associated with a risk of developing cancer. Therefore, careful evaluation and management during treatment are required.Copyright © 2024 the Author(s). Published by Wolters Kluwer Health, Inc.

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