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Left lateral aspect of the cerebral hemisphere showing significant subarachnoid hemorrhage in the region of the Sylvian fissure. This pattern of hemorrhage is suggestive of an aneurysm in the middle cerebral artery distribution on the left. 
The dissected circle of Willis in this patient as shown from below. The probe on the right side shows a ruptured aneurysm in the left middle cerebral artery. There is a second aneurysm in the anterior communicating artery which is not ruptured and is also indicated by a probe.
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Coronal section of the frontal lobe anterior to the Sylvian fissure showing a large hematoma in that region. Note the extensive swelling of the left hemisphere compared to the right. 
Slightly further back again with hemorrhage in the subarachnoid space, significant softening of the insular cortex with brain swelling and some left to right shift. 
Transverse sections of the cerebellum and brain stem with a large hematoma in the dorsal aspect of the midpons. 
. LSD. Neuronal ballooning due to lysosomal storage
Creutzfeldt-Jacob disease. Spongiform encephalopathy. The patient also had Alzheimer Disease. One Alzheimer plaque is seen in the upper left quadrant
Creutzfeldt-Jacob disease. Severe cortical atrophy. 
Lobar hemorrhage from cerebral amyloid angiopathy
Arteriovenous malformation
Subarachnoid hemorrhage from a ruptured anterior cerebral artery aneurysm
Large saccular aneurysm masquerading as a cerebellopontine angle tumor
Saccular (Berry) aneurysm of the MCA. 
Spontaneous dissecting aneurysm of the MCA. Elastic stain. Note intramural hematoma collapsing the vessel lumen
Severe atherosclerosis of the circle of Willis in a patient with hypercholesterolemia. 
