Bilateral choroid plexus cysts in the lateral ventricles.

A 4-year-old boy had slight retardation of psychomotor development and a history of three febrile convulsions. He had been in good health until a generalized seizure occurred. On the day of admission, he was in status epilepticus, but the seizures were controlled by administration of diazepam and phenobarbital. CT of the brain showed no abnormality. The day after admission, the patient was alert and asymptomatic. Results of a general physical examination and routine laboratory studies were normal. An electroencephalogram showed decreased normal rhythm and slowing in the delta range, with sharp waves in both centroparietal areas. MR showed bilateral round cystic masses, 14 x 12 mm on the right and 11 x 9 mm on the left, in the trigones of the lateral ventricles (Fig . 1 ). On T1and T2-weighted images, the cysts had a slightly higher signal than that