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OBJECTIVE AND IMPORTANCE: Cavernous malformations can present in children with a sporadic course of repeated hemorrhage and enlargement, but they are rarely aggressive, infiltrative, or multilobar. We present the case of a young boy with a complex cavernous malformation that evolved during the course of a decade to encompass the majority of his right cerebral hemisphere.

CLINICAL PRESENTATION: A 16-month-old boy presented with seizures, and radiographic studies demonstrated a large cavernous malformation in his right frontal pole. During the next 10 years, his seizures became intractable, and he developed progressive left hand weakness and atrophy. His malformation infiltrated his entire right frontal lobe as well as portions of his right parietal lobe, temporal lobe, and deep gray matter structures.

INTERVENTION: The patient underwent right hemicraniotomy and near total resection of the lesion …