FAC usually shows multiple sites of necrosis and perforation of the colon, ranging from superficial ulcer, flask-shaped ulcer to transmural necrosis.

• 猛暴性阿米巴大肠炎是先由浅层之肠壁黏膜溃疡发展至全层肠壁之坏死，并合并有典型的烧杯状溃疡。