PMC4929387_01
Abdominal CT scan showing a moderate amount of ascites and diffuse peritoneal infiltration with omental cake formation (arrows).
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F1
The irregularly thickened peritoneum across the abdomen and the reticular membrane in the upper left abdomen formed a mass (fig. 1).
Laparoscopic findings. a Variable-sized multicystic masses are seen in front of the paracolic gutter space. b Numerous 2- to 3-mm-sized nodular lesions that seemed like peritoneal seeding masses are observed in the peritoneal cavity.
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F2
The laparoscopic examination showed several cystic masses in the paracolic gutter forming a large mass (fig. 2a). There was much yellowish ascites, and multiple nodules of a size of 2-3 mm were widely spread in the abdominal cavity (fig. 2b).
Microscopic findings. a H&E staining (x100) reveals multiple variable-sized cysts lined with flattened epithelial cells. b Calretinin immunohistochemical staining (x100) reveals a positive reaction.
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F3
The biopsy result showed several cysts of various sizes, which were surrounded by flat cubic epithelial cells (fig. 3a). As the biopsy did not stain for CD31 but strongly stained for calretinin and D2-40, the patient was diagnosed with BCM (fig. 3b).