2025 Volume 106 Issue 1 Pages 48-51
A 62-year-old man was referred to our department for evaluation of an intra-abdominal cyst detected during a routine health check. Computed tomography showed a unilocular, homogeneous cyst adjacent to the pylorus. Upper gastrointestinal endoscopy and endoscopic ultrasound revealed a cystic lesion located outside the fourth layer of the gastric wall. Based on these findings, a diagnosis of a gastric duplication cyst was made, and surgical resection was performed because of the risk of malignancy. Histopathological analysis revealed a single layer of columnar epithelium lining the cyst, which was located in the subserosal tissue. Although gastric duplication cysts are often asymptomatic, their risk of malignancy increases with size. Therefore, surgical resection should be considered when such cysts are identified. Accurate diagnosis and management rely on thorough evaluation with imaging modalities.
