Figure 1From: Calcitonin-producing well-differentiated neuroendocrine carcinoma (carcinoid tumor) of the urinary bladder: case report Composite figure of carcinoid tumor of urinary bladder. A) a glandular arrangement of tumor cells is evident. B) normal urothelium lined the tumor. A von Brunn nest entrapped by the tumor is seen. C-D-E) diffusely positive synaptophysin, chromogranin, and calcitonin immunostaining of tumor cells, respectively. F) urothelium and tumor cells strongly reacted with keratin 7.Back to article page