Large Gastric Pyloric Gland Adenoma Mimicking Malignancy on FDG PET/CT.

A 51-year-old woman presented with intermittent upper abdominal pain for two years and unintentional weight loss recently. Gastroscopy revealed a large cardia mass protruding into the gastric lumen. CT examination suggested malignant gastric tumor. Subsequently, ¹⁸F-FDG PET/CT demonstrated heterogeneous intense uptake in the gastric mass. Pathologic examination identified a gastric pyloric gland adenoma by immunohistochemistry. The lesion was resected locally, and the patient recovered well.