Abstract Angiographic features in three cases of hemangioblastoma arising from the posterior aspect of the medulla oblongata are compared with those found in a case of hemangioblastoma of the cerebellar tonsil. All cases displayed a dense stain of the nodular portion of the lesion, a mass effect of the cystic portion, and early filling of draining veins. Medullary lesions produced separation of the posterior medullary segments and the choroidal loops of the posterior inferior cerebellar arteries (PICA). The tonsillar lesion stretched the supratonsillar segments and displaced the ipsilateral PICA branches to the opposite side across the midline.