Entrapment of temporal horn: First case of bilateral occurrence and review of literature

The entrapped temporal horn is a rare entity, caused by an obstruction of the trigone of the lateral ventricle which seals off the temporal horn from the rest of the ventricular system. This form of focal hydrocephalus has been described in a variety of diseases including central nervous system infections, hemor- rhages, trauma, extra-axial or intra-axial tumors, postoperative scarring within the trigone, neurosarcoidosis and xanthogranu- lomatosis. Clinical presentation is often with headache, seizures, hemiparesis, and visual field deficits [9]. Within the trapped temporal horn, the choroid plexus continues to produce cerebro spinal fluid (CSF), resulting in progressive dilation; the dilated temporal horn then behaves as a mass lesion. Since 1947, thirty-six cases have been reported (Table 1). To the best of our knowledge this is the first case of bilateral entrapped temporal horn.