THE PECULIAR nature of the carcinoid group of tumors has prompted this survey of our experience with these tumors at the New York Hospital. Carcinoids have always evoked a great deal of interest because of their unique character. Histologically they appear the same regardless of their gross anatomic position, yet the decision whether or not they are benign depends more on their anatomic location than their histologic appearance. Appendiceal carcinoids are customarily considered benign, whereas carcinoids elsewhere are looked upon as malignant. The cases herein reported represent a 20-year experience, from 1932 to 1952. The great majority were from the surgical service of the New York Hospital, a few from the gynecological service, and two additional such tumors were found incidentally at necropsy. Though several series of carcinoids have been reported recently, we feel that it is worth while to report our experience at the New York Hospital-Cornell Medical Center.