Abdominal computerized tomography findings in patient 1. A 63-year-old male (patient 1) presented with acute melena and hemoglobin decline to 6.2 g/dL, and esophagogastroduodenoscopy revealed a huge, submucosal mass with a smooth overlying surface and exhibiting the pillow sign characteristic of a submucosal lipoma. Illustrated abdominal computerized tomography shows an approximately 13.4 cm × 8.2 cm × 8.4 cm mostly homogeneous, hypodense mass with a characteristic attenuation of fat (-90.2 Hounsfield units) extending from proximal gastric body through entire antrum. The normal-appearing very proximal stomach is filled with oral contrast without a mass, and leads to a very narrow, compressed, distal and dorsal, gastric channel containing oral contrast that passes into the duodenum. Triangle: antral giant gastric lipoma which has the characteristic hypodense attenuation of fat.