Partialy ulcerated mucosal fragments by related malignant glandular epithelium forming irregular, back-to-back and cribriform glands with focal solid growth. Tumor cells show nuclear pleomorphism, hyperchromasia, prominent nucleoli. Anaplasia and mitoses are moderate. A desmoplastic stromal response is present. Lymphovascular invasion is noted.
Distal common bile duct lesion (ampullary biopsy).
Soft tissue fragments collectively measured 0.7x0.5 cm, totally embedded.
Ampullary lesion, endoscopic biopsy: