RT Journal Article SR Electronic T1 Ischemic chiasmal syndrome and hypopituitarism associated with progressive cerebrovascular occlusive disease. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 367 OP 372 VO 5 IS 4 A1 J Ahmadi A1 J R Keane A1 G S McCormick A1 R J Fallis A1 C A Miller YR 1984 UL http://www.ajnr.org/content/5/4/367.abstract AB Two interesting patients are described with unique clinical and radiographic manifestations of progressive bilateral stenosis-occlusion of the distal internal carotid arteries. Their clinical presentations, ischemic chiasmal syndrome and hypopituitarism, are extremely rare, despite extensive occlusion of the circle of Willis. In one of these patients, the configuration of collateral vessels around the optic chiasm on computed tomography (CT) was so rounded and discrete that it actually had an appearance suggesting a pituitary tumor or an aneurysm. In the second patient, a pseudoaneurysm and a very large intracerebral hematoma with a ring of contrast enhancement were the radiographic manifestations.