Fragmented biopsy showing tumor composed of tubular and few papillae with delicate fibrovascular cores, covered by pseudostratified columnar epithelium. Few of these columnar cells show cytoplasmic vacuoles and some cells show enlarged hyperchromatic nuclei (mild atypia). Picture is consistent with ampullary adenoma, intestinal type with mild atypia.
Obstructive jaundice. Retroampullary biopsy was taken.
Soft tissue fragments collectively measured 0.7x0.6 cm, totally embedded.
Ampulla of Vater, Endoscopic biopsy: