The term Carcinoid was given by Siegfried Oberndorfer, a German pathologist at the University of Munich in 1907. Enterochromaffin cell, the cell of origin of carcinoid tumour had been identified as early as 1897 by N. Kulchitsky.

• Theodor Langhans (1839–1915) was the first to describe the histology of a carcinoid tumor in 1867.
• The term Carcinoid was given by Siegfried Oberndorfer, a German pathologist at the University of Munich in 1907.
• Siegfried Oberndorfer referred the carcinoid tumor as “benign carcinomas” as they had distinct clinical entities and named them “karzinoide”(carcinoma-like).
• Karzinoide or “carcinoma-like” describes the unique feature of behaving like a benign tumor despite resembling a carcinoma microscopically.
• Rapport and colleagues isolated and named serotonin (5-HT), initially identified as a vasoconstrictor substance in the serum.^[1]
• Enterochromaffin cell,the cell of origin of carcinoid tumour had been identified as early as 1897 by N. Kulchitsky (1856-1925).
• In 1953, F. Lembeck established that enterochromaffin cells synthesizes and secretes serotonin, the major hormone responsible for carcinoid syndrome.^[2][3]