Development of perianal ulcer as a result of acute fulminant amoebic colitis

Figure 1 A giant ulcer covered with necrotic tissue is identified in the perianal region.

Figure 2 Abdominal computed tomography revealing an abscess formation of the perianal region. A: The axial view shows an abscess of the perianal region due to necrosis; B: The sagittal view shows an abscess formation extending from the perianal region to the lower rectum.

Figure 3 Macroscopic findings of the resected colon following end-sigmoidostomy show numerous deep ulcerations covered with yellow necrotic plaques.

Figure 4 Histopathological findings of the surgical specimen show trophozoite amoebae that have ingested red blood cells (arrows) (HE staining).