Angiodysplasia of the colon

Low power view of a colonic biopsy in angiodysplasia shows mucosal and submucosal vascular dilatation and congestion.

Low (left) and high (right) power views of a biopsy of a normal colon. Low power reveals straight crypts and mild lamina propria mononuclear cell infiltration. High power shows the surface enterocytes with interspersed goblet cells (arrows).