We report a 12-year-old with intracerebral hematoma and subarachnoid hemorrhage secondary to the rupture of a peripheral lenticulostriate artery aneurysm. We carried out proximal clipping of the lateral lenticulostriate artery at the middle cerebral artery following six days of continuous ventricular drainage for acute hydrocephalus. Postoperative angiography confirmed the obliteration of the aneurysm. The girl was discharged without any neurologic deficits. To our knowledge, this is a first reported case in the literature of a ruptured peripheral lenticulostriate artery aneurysm in childhood. The pathogenesis of such an aneurysm and the treatment modalities are discussed.