1. Origin of Pretruncal Nonaneurysmal Subarachnoid Hemorrhage: Ruptured Vein, Perforating Artery, or Intramural Hematoma? 
Wouter I. Schievink, MD,, Eelco F.M. Wujicks, MD 
Mayo Clinic Proceedings 
Volume 75, Issue 11, Pages (November 2000)
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2. Figure 1
Computed tomograms of patients with pretruncal nonaneurysmal subarachnoid hemorrhage showing localized hemorrhage in the prepontine (left) and interpeduncular (right) cisterns.
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3. Figure 2
Intraoperative photograph (left) and corresponding line drawing (right) of the prepontine and interpeduncular cisterns in a patient who underwent an orbitozygomatic craniotomy. Note the proximity of the possible sources of pretruncal nonaneurysmal subarachnoid hemorrhage.
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4. Figure 3
Magnetic resonance images (left and right) of patients with pretruncal nonaneurysmal subarachnoid hemorrhage. Note the proximity of the hematomato the basilar artery lumen.
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5. Figure 4
Frontal vertebral angiogram of a patient with a pretruncal nonaneurysmal subarachnoid hemorrhage. Note the smooth mild stenosis of the basilar artery as it traverses the prepontine cistern (arrowheads).
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6. Figure 5 A primary intramural hematoma of the basilar artery.
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