In pathology, an<unk>  is an endocrine tumour that arises from an APUD cell. from structures such as the ampulla of Vater, pancreas, and prostate. They are derived from neural crest cells.  The term dates back to at least 1975. Because the label<unk> " is very general, it is preferred to use a more specific term when possible.
Apudoma
Rhinoscleroma
Spiradenoma
Spider angioma
Scotoma
Nevus of Ota
Halo nevus
Cholesteatoma