Focally ulcerated colonic mucosa moderately infiltrated by lymphocytes and plasma cells. Mucigenic cells are mildly decresead. Some neutrophils are seen infiltrating glands but there is no evidence of crypt abscesses. No evidence of atypia or malignancy.
Left sides colitis, hyperemic mucosa and erosions in the descending colon and rectosigmoid.
Soft tissue fragments collectively measured 0.6 cm, totally embedded.
Colon, endoscopic biopsy: