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 Clipped 5 Years: Gross natural color close-up of pituitary fossa and internal carotid arteries shows clip in place in posterior cerebellar artery