BRAIN - Aneurysm of the basilar artery

This shows the under-surface of the brain, with the basal portions of the temporal lobes cut away. The basilar artery is tortuous and enlarged in a nodular fashion; the left vertebral artery can be seen on the right-hand side of the specimen, but the right vertebral artery cannot be seen. There is extensive atheroma of the middle cerebral arteries. Inspection of the whole specimen shows neither haemorrhage nor infarction. No history is available.