PEIR Digital Library

Welcome to the Pathology Education Informational Resource (PEIR) Digital Library, a multidisciplinary public access image database for use in medical education.

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GROSS: CARDIOVASCULAR: VASCULATURE: Circle of Willis, nervous system: Berry Aneurysm Ruptured: Gross natural color close-up view of base of brain showing subarachnoid hemorrhage over anterior surface of pons and a large aneurysm at top of photo which is located in the right internal carotid artery