Findings

The ulcer shown in this image has a narrow opening through the mucosa and extends out laterally in the submucosa, undermining the mucosa and forming a "flask-shaped" defect.

Impression

Colon, amebic colitis

Preparation

Fixed, H & E stain

View

Light microscopy

Specimen

Colon

Image Credit

Katsumi M. Miyai, M.D., Ph.D
Department of Pathology
School of Medicine
University of California, San Diego