Limbic system symptomatology associated with colloid cyst of the third ventricle.

The clinical manifestations of olfactory and gustatory hallucinations are commonly attributed to temporal lobe involvement. The case is presented of a 46-year-old man with prolonged episodes of olfactory and gustatory hallucinations, who was found to have a colloid cyst of the third ventricle. Exhaustive electroencephalographic and radiological studies were negative except for the cyst. Stereotaxic aspiration of the cyst resulted in immediate cessation of all symptomatology with a follow-up of 14 months.