Colloid cyst of velum interpositum: a rare finding.

The authors present the case of a child with a colloid cyst of the velum interpositum. To the best of the authors' knowledge, this is the first reported case in the pediatric literature and only the second reported case to date. The patient was of an 11-year-old boy in whom this lesion was found after a minor head injury. He had a 6-month history of memory deficits. A lesion consistent with a colloid cyst was seen in the region of the velum interpositum, in the roof of the third ventricle. This lesion was excised successfully via a transcallosal interfornical approach. There were no new postoperative deficits and the child made a full recovery of time.