<prompt> What is true about Carcinoid tumor:Always benignKulchitsky cell tumorPresent with paroxysmal hypertensionPunch biopsy is diagnostic  <response>: Ans. b Kulchitsky cell tumourRef : Harrison 18th ed. ch. 350 Carcinoid tumors arise from argentaffin cells of the crypts of Lieberkuhn and are found from the distal duodenum to the ascending colon, areas embryologically derived from the midgut. More than 50 of intestinal carcinoids are found in the distal ileum, with most congregating close to the ileocecal valve. Most intestinal carcinoids are asymptomatic and of low malignant potential, but invasion and metastases may occur, leading to the carcinoid syndrome. Carcinoid tumors are classified as Typical carcinoid Atypical carcinoid It can be benign or malignant and presents with secretory diarrhea and flushing. Diagnosis is made by Octreoscan and urinary 5 H.I.A.A Hydroxy-indole- acetic acid levels. Drug of choice is Octreotide. 