prostate carcinoid tumor

True carcinoid tumours of the prostate, which meets the diagnostic criteria for carcinoid tumour elsewhere are exceedingly rare.

These tumours show classic cytologic features of carcinoid tumour and diffuse neuroendocrine differentiation (chromogranin A and synaptophysin immunoreativity).

They should be essentially negative for PSA. The prognosis is uncertain due to the small number of reported cases.

The term "carcinoid-like tumours" has been used to refer to a variety of miscellaneous entities, most of which refer to ordinary acinar adenocarcinoma of the prostate with an organoid appearance and focal neuroendorcrine immunoreactivity.