Fig. 3
From: Carcinomas in the bladder with papillary and pseudopapillary morphology - not always urothelial
Case 3. Primary adenocarcinoma of the bladder. Villous architecture with true fibrovascular cores (a: HE stain, 40x) showing pseudostratified columnar and goblet cells (b and c: HE stain, 100x). The tumor invades prostatic stroma showing extracellular mucin and dirty necrosis (d: HE stain, 40x). Signet-ring component is evident (e: HE stain, 100x). Villin expression in brushborder pattern (f: villin immunostain, 100x)