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Four patients with dural arteriovenous malformation (AVMs) draining into the cavernous sinus, who presented ophthalmic manifestations, were studied by magnetic resonance (MR) imaging. In all patients signal decrease in the involved cavernous sinus was demonstrated in coronal spinecho (SE) imaging. It is attributable to rapid venous flow in the sinus, and this 'high velocity signal loss' is a fairly pathognomonic finding in this condition. We stress the validity of MR imaging in the primary diagnosis of dural AVMs with ophthalmic symptoms. [ABSTRACT FROM AUTHOR]

By studying patients with clinically suspected cerebrovascular occlusive disease using dynamic CT technique, we have shown that contrast peak attenuation of the whole normal cerebral tissue was uniformly reached at the same time within a given individual. On the other hand, the delay of peak time was shown to correlate with some vascular occlusive mechanism. The main implications of delayed contrast peak time can be summarized as follows: (1) Reduced regional blood flow due to stenosis or occlusion of main vessel without tissue damage. (2) Delayed contrast arrival time due to occlusion of main vessel, but with sufficient circulation. (3) Tissue organically injured by cerebrovascular occlusion. [ABSTRACT FROM AUTHOR]