Enterogenous cyst of the third ventricle.

We present the second case of an enterogenous cyst of the third ventricle. This is a 28-year-old woman who presented with a 2 year history of progressive headaches and memory loss. A cystic lesion of the anterior third ventricle was noted on MRI. The cyst was resected via a transcallosal approach and demonstrated simple cystic morphology lined by ciliated cuboidal epithelium with numerous goblet cells. The presentation was unusual with signs of memory loss presumably due to a mass effect on the fornices. Although uncommon, this entity should be considered in the differential diagnosis of a cystic lesion of the third ventricle.