Fig. 1

Endoscopic and histological features of malakoplakia in the ascending colon. A A hummock-type protrusion in the middle of the ascending colon. Its surface mucosa is smooth and the same color as the surrounding mucosa but with hyperemic mucosa at the top and the edema covered with a white moss-like coating. B Disappearance of most of the intestinal mucosa with only small patches of mucosal tissue remaining. The patches are mixed with neutrophils and lymphocytes (H&E, magnification × 100). C Histiocytes showing diffuse cytoplasmic CD68 staining (magnification × 100). D Histiocytes showing diffuse cytoplasmic CD10 staining (magnification × 100)