title: Angiographically occult vascular malformations causing intracranial hemorrhage.
abstract: In 5 patients, angiographically occult vascular malformations led to intracerebral or intracerebellar hemorrhages. Angiographic findings were not suggestive of vascular abnormalities, but signs of a mass were present in 4 patients. Computed tomography (CT) scanning suggested the presence of cryptic vascular lesions accompanied by intraparenchymal hemorrhage in 2 patients. In all patients surgical treatment was successful. Histological examination confirmed these lesions to be venous malformations in the cerebellum in 2 patients and in the left frontal region in 1, and arteriovenous malformations in the cerebellum and right putaminal region in 1 patient each.
mesh_terms: D000368:Aged; D002531:Cerebellum / Q000098:blood supply*; D002533:Cerebral Angiography; D002543:Cerebral Hemorrhage / Q000209:etiology*; D005260:Female; D005625:Frontal Lobe / Q000098:blood supply*; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000150:complications / Q000000981:diagnostic imaging* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011699:Putamen / Q000098:blood supply*; D014057:Tomography, X-Ray Computed