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: GASTROINTESTINAL: Colon: Necrotizing Colitis: Gross natural color close-up view of severe and extensive ulceration looks like ulcerative colitis with pseudopolyposis but it is due to ischemia