A case of small undifferentiated pancreatic carcinoma detected during follow-up for focal pancreatic parenchymal atrophy with fatty replacement. - Agatsuma N; Minaga K; Nakayama R; Ono K; Nakano S; Matsumoto H; Uenoyama Y; Yamashita Y; Seno H (Clinical journal of gastroenterology, 2026)