Carcinoid tumor of the common bile duct: A rare complication of von Hippel-Lindau syndrome

Figure 2 Trabecular pattern of neuroendocrine cell proliferation (HPS, × 200). Insert: (1) Strong staining of all tumor cells (NSE, × 200). (2) S-100 nuclear staining of 20% of tumor cells which also co-expressed NSE (× 400). No sustentacular staining pattern. NSE: neuron-specific enolase; HPS: Hematoxyline-phloxine-safran.