Which of the following is most frequently associated with the typical form of carcinoid syndrome ?: (A) Foregut carcinoid, (B) Midgut carcinoid, (C) Hindgut carcinoid, (D) None of the above
Answer is B. Midgut carcinoids are argentaffin-positive and have a high serotonin content. They most frequently cause the typical carcinoid syndrome when they metastasize. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 3058