Entrapment of the Temporal Horn: A Form of Focal Non-communicating Hydrocephalus Caused by Intraventricular Block of Cerebrospinal Fluid Flow —Report of Two Cases—

In two cases of entrapment of the temporal horn, computed tomography demonstrated the typical appearance of a comma-shaped homogeneous area isodense with water surrounded by a periventricular low-density area. The cause was probably choroid plexitis resulting in obstruction of the cerebrospinal fluid pathway at the atrium. External drainage followed by shunt emplacement is indicated.