In case of carcinoid tumor which site is having least potential for malignancy -

Ans is 'a' ie lung Were you thinking appendix ? Have a look at this table from Harrison 17/e. Site of Carcinoid % of total Incidence of metastasis * Foregut Esophagus <0.1 ? Stomach 4.6 10 Duodenum 2.0 ? Gallbladder 0.3 17.8 Bronchus, lung, trachea 27.9 5.7 Pancreas 0.7 71.9 * Midgut Jejunum 1.8 58.4 Ileum 14.9J Meckel's diveicuhun 0.5 ? Appendix 4.8 38.8 Colon 8.6 51 Liver 0.4 32.2 Ovary 1.0 32 Testis <0.1 ? * Hindgut Rectum 13.6 3.9 Thus: Comparing from this table we see least potential for malignancy --> Rectum followed by bronchus & lung. Also note Maximum potential for malignancy --> Pancreatic carcinoid followed by small intestine MC site for carcinoid tumor --> Intestine or GIT as a whole Bronchus Hind MC)