obsolete_carcinoid tumor true true ICD9:209.60 Editor note: In NCIT all carcinoid tumors are grade 1, but the name is sometimes used more broadly in other sources carcinoid tumor 3.88.0 NET G1 HP:0100570 OMIM:114900 MESH:D002276 carcinoid tumor (disease) carcinoid tumor (disease) Replaced by Mondo term MONDO_0005369, with which this term was previously merged. Use: http://purl.obolibrary.org/obo/MONDO_0005369 neuroendocrine neoplasm G1 SCTID:443492008 ICDO:8240/3 ICDO:8241/3 GARD:0009316 carcinoid NCIT:C2915 A slow growing neuroendocrine tumor, composed of uniform, round, or polygonal cells having monotonous, centrally located nuclei and small nucleoli, infrequent mitoses, and no necrosis. The tumor may show a variety of patterns, such as solid, trabecular, and acinar. Electron microscopy shows small secretory granules. Immunohistochemical studies reveal NSE, as well as chromogranin immunoreactivity. Malignant histology (cellular pleomorphism, hyperchromatic nuclei, prominent nucleoli, necrosis, and mitoses) can occasionally be seen. Such cases may have an aggressive clinical course. Gastrointestinal tract and lung are common sites of involvement. http://purl.obolibrary.org/obo/MONDO_0005369 neuroendocrine tumor G1 EFO:0004243