Anatomic variations in the major arteries of the upper extremities have been reported in 11-24.4% of individuals. In a review of 100 upper extremity arteriograms, we found an overall incidence of 9%. High origin of the radial artery from the brachial artery was the most frequently encountered anomaly occurring in 7% of individuals and accounting for 78% of all anatomic variations. Origin of the radial and ulnar arteries from the axillary artery was an infrequent finding occurring in only 2% of extremities.

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Computed tomographic (CT) patterns of intracranial hemorrhage (ICH) were determined in 1,696 patients undergoing thrombolytic therapy for acute myocardial infarction. ICH occurred at 33 sites in 0.77% of patients (n = 13). Thirty-six percent of hemorrhages (n = 12) were intraparenchymal, 33% (n = 11) were subdural, 24% (n = 8) were subarachnoid, and 6% (n = 2) were intraventricular. Eight-four percent (n = 26) of all nonventricular hemorrhages were supratentorial in location. The most common site of ICH was supratentorial and intraparenchymal (10 of 33). In 11 of the 13 patients with ICH, clinical symptoms occurred within 24 hours of the initiation of thrombolytic therapy. A fatal outcome resulted in three of the four patients who had clinical symptoms within 3.5 hours after beginning thrombolytic therapy. The CT findings of multiple intracranial bleeding sites, substantial mass effect with midline shift, and large-volume intraparenchymal hematomas were associated with increased mortality. ICH associated with thrombolytic therapy for acute myocardial infarction has a grave prognosis, with 62% of patients dying during hospitalization.