The patient underwent craniotomy and resection.
Histopathology
MICROSCOPIC DESCRIPTION: The sections show a circumscribed nidus of vascular channels surrounded by brain parenchyma. The channels are a mixture of venous and arterial structures. In the central area of the lesion there is a back-to-back arrangement of thin-walled vessels the walls of which are composed entirely of collagen. In the more peripheral zone of the lesion, an arteriovenous fistula is discernible. Brain parenchyma intervening between the larger vascular channels contains collections of haemosiderin-filled macrophages. The overall appearances are of a vascular malformation with combined features of cavernoma and arteriovenous malformation. No evidence of tumour is seen.
DIAGNOSIS: Vascular malformation with combined features of cavernoma and arteriovenous malformation.