Large benign cystic teratoma of the mesosigmoid causing intestinal obstruction: report of a case.

We report the case of a large benign cystic teratoma of the mesosigmoid in a 2-year-old child. To the best of our knowledge, this type of lesion has never been described in the English literature, although there are a few reports of teratomas arising from the greater and lesser omentum. There was diagnostic confusion due to the rarity of a teratoma arising from the peritoneal folds and also because calcification was not detected radiologically. A brief review of the literature on the diagnosis and treatment of similar lesions is presented.