Traumatic production of an intracranial berry-like aneurysm in a monkey

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Abstract
A berry-like dissecting intracranial aneurysm resulted from inadvertent puncture of the internal carotid artery during trans-palatal section of a monkey's optic nerve. The light and ultrastructural features are rather similar to those of human berry aneurysms supporting the notion that the latter are degenerative rather than congenital in origin.