Most of submitted fragments showing inflamed colonic mucosa. Few fragments showing focally ulcerated colonic mucosa, infiltrated by malignant tumor composed of complex, anastomosing glandular and cribriform architectures, with solid sheets. The tumor cells exhibit moderate anaplasia, with active mitosis. Surrounding stroma exhibits desmoplastic reaction, with associated mixed acute and chronic inflammatory cell infiltrate.
Lower rectal mass.
Soft tissue fragments collectively measured 1 cm, totally embedded.
Rectal mass, endoscopic biopsy: