An 81-year-old male was referred to our department with a tumor in the left wall of the urinary bladder, which was detected by contrast-enhanced abdominal computed tomographic scan (CT), incidentally. Cystoscopy revealed a smooth non-papillary tumor. The patient underwent transurethral resection (TUR) of tumor. An immunohistochemical study showed the tumor cells positively stained for chromogranin A, synaptophysin, CD56, and Ki67. The Ki67 index of the tumor was ＞0.5%, which confirmed the diagnosis of a pure carcinoid tumor. There was no recurrence of bladder tumor and no metastasis after the primary treatment.
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