Supratentorial Brain Cysts

W E HAVE seen four unusual cases of benign, solitary, supratentorial brain cysts, none of which communicated with the subarachnoid or ventricular systems. Until Starkman and Brown described the clinical entity of supratentorial arachnoidal cysts 17 in 1958, most of these lesions had been included in discussions of porencephaly, pseudoporencephaly, or cystic hygroma? All of the cysts in our series behaved as intracranial masses, were associated with progressive neurological dysfunction, and were diagnosed preoperatively as brain tumors.