[Traumatic aneurysm of the cortical branch of the middle cerebral artery].

A 22-year-old patient is described in whom sudden deterioration developed on the 9th day after severe craniocerebral trauma. Left common carotid angiography demonstrated an aneurysm on a cortical branch of the middle cerebral artery and subdural haematoma. During the operation the aneurysm was excluded from the circulation.