The histogenesis of carcinoid tumours of the rectum.
;Carcinoid' tumours of the rectum have been described which are classified on histological appearances into three main varieties: ;true' carcinoid or argentaffinoma, ;atypical' or non-argentaffin carcinoid, and ;composite carcinoid. The histogenesis of these tumours is discussed and it is suggested that non-argentaffin carcinoids of the rectum have an essentially similar histogenesis to certain tumours of the lung, pancreas, and gastrointestinal tract. The difference in growth, pattern, and staining reactions are a reflection of differing directions and levels of differentiation of the parent epithelium. The functional implications of this hypothesis are discussed.
D000230:Adenocarcinoma; D002276:Carcinoid Tumor; D003581:Cytodiagnosis; D005770:Gastrointestinal Neoplasms; D006801:Humans; D008303:Malignant Carcinoid Syndrome; D012004:Rectal Neoplasms; D012007:Rectum; D013724:Teratoma
ADENOCARCINOMA; ARGENTAFFINOMA; CYTODIAGNOSIS; MALIGNANT CARCINOID SYNDROME; RECTAL NEOPLASMS; TERATOID TUMOR