Yasuhiro Fujino, Shingo Kanaji, Kentaro Kawasaki, Masahiro Tominaga, Kazuyoshi Kajimoto
Context Mucinous cystic neoplasms are a family of morphologically similar tumors arising in the pancreas, ovarium, appendix, hepatobiliary tract, and more rarely in the retroperitoneum, testis, lung, breast, spleen, bowel, and mesentery. Case report A sixty-three-year-old male diagnosed with abdominal cystic lesions was referred to our hospital. Abdominal computed tomography revealed two cystic tumors of the abdomen around the spleen and the stomach. We performed surgery because they were suspected of being malignant. One tumor was resected with the distal stomach, and the other was resected with the spleen. There were no abnormal findings involving the appendix or mesentery. Pathological examination demonstrated mucinous cystadenoma associated with ectopic pancreatic tissue of the stomach and mucinous cystadenocarcinoma of the spleen. There was no finding of oncological association between the two lesions. Conclusion A male with multiple MCNs, in whom there was no oncological association, is rare, and was surgically treated with good prognosis.