Fig. 5

Pathological findings. a Macroscopically, the external surface of the mass had a whitish-yellowish and lobulated appearance. The tumor protruded from both sides of the mesenteric leaves was surrounded by the peritoneum of the mesentery, measured 50 × 45 mm in size, and was located in the peripheral part of the mesentery adjacent to the jejunum. b, c The small intestinal mucosal surface formed a hemispherical uplift approximately 24 × 20 mm in size and was adjacent to the mesenteric lesion without contraction. d A formalin-fixed specimen. Café-au-lait-colored chyle-like milky fluid flowed out from inside the tumor after the tumor was cut. e The cut surface of the tumor showed multicystic lesions of various sizes without solid components or mural nodularity