Abstract
A 69-year-old man presented the hospital because of appetite loss. He was found the mass lesion around the stomach, pancreas, and spleen, and found the low density area of the liver by abdominal CT. He would be taken farther examination, but he had severe abdominal pain next day, and made an emergency admission. We diagnosed his illness as peritonitis and liver abscess due to pancreatitis, and had done cnservative therapy. But after several days, it was cleared that the mass lesion of the pancreas was the malignant tumor by percutaneous aspirated biopsy. We performed operation and diagnosed it as gastrointestinal stromal tumor (GIST) of the stomach. In the Japanese literature, no case of GIST of the stomach with liver abscess and peritonitis was reported. So we assume this case to be very rare.
