Volume 67 No 4  Cover Story

A case of radiation induced cavernous malformation. Gamma Knife Radiosurgery (GKRS) was done on a target volume of 3.6cm with 24 Gy (upper left) for recurrence seizure after anterior temporal lobectomy. After initial remission, seizure recurred 5 yr later and progressive visual disturbance developed 7 year after GKRS. Magnetic resonance imaging revealed 3 cm-sized enhancing mass at the previous GKRS field (arrow, upper right). The mass was excised (lower left), and was confirmed as cavernous malformation on pathologic specimen (lower right). The patient did not experience further neurological deficits and became entirely seizure-free.