The patient was a 76-year-old woman. She had been undergoing periodic enteroscopy at another hospital. She was referred to our department for CS. When CS was performed at our hospital, a flat lesion with a yellowish-white color and a diameter of 20 mm was observed on the anterior wall of the lower rectum within 8 cm of the anal verge. NBI of the same area showed that the existing honeycomb network was still present, and a whiteish deposit was clustered in the subepithelium. A biopsy was performed to confirm the presence of subepithelial deposits. Pathological examination revealed infiltration and aggregation of macrophages phagocytosing granular crystals, leading to the diagnosis of barium granuloma.
