Abstract
A 60-year-old female patient was referred to our hospital complaining of abdominal pain. Abdominal CT revealed a multilocular cystic tumor of the sigmoid colon causing colonic stenosis. Sigmoidectomy with D2 lymph node dissection was performed semi-emergently because of sub-ileus. The tumor was 7×5×3cm in size, multilocular, and contained mucinous fluid. Histological examination revealed that the cyst was covered with columnar epithelium, and an eosinophilic layer consisting of short spindle cells, the so-called ovarian-like stroma, was clearly observed under the epithelium. The stromal cells showed immunopositivity for estrogen receptor, progesterone receptor, and inhibin. On the basis of the findings, the tumor was diagnosed as a mucinous cystic neoplasm of the sigmoid colon.
Mucinous cystic neoplasms with an ovarian-like stroma are rare tumors and most often arise from the pancreas or the liver ; such tumors arising from other sites are extremely rare. There are no case reports yet of MCN of the colon in the literature. We are therefore reporting this case here, with a review of the literature.
