[A Case of Acinar Cell Carcinoma-Difficult to Differentiate on Imaging Pre-Laparoscopic Distal Pancreatectomy].

An 80s man was diagnosed appendicitis and an incidental 33 mm cystic mass with a substantial component in the pancreatic body by contrast-enhanced CT. The enhancement component was stained early contrast. By MRI, component was pale high signal on diffusion-weighted images, and low signal ADC maps. The cyst was low signal on T1WI and slightly heterogeneous high signal on T2WI. Because of suspected mucinous cystic neoplasm(MCN), we performed laparoscopic distal pancreatectomy. By immunostaining, BCL-10 and trypsin were positive. Definite diagnosis was acinar cell carcinoma(ACC). He has been recurrence-free for 5 years without additional treatment. When a pancreatic mass with a mixture of cystic and enhancing components is found, ACC should be included int the differential diagnosis.