You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following is true about gastrointestinal carcinoid tumor? and explain in detail?
Answer- D. Preoperative octreotide scanning can detect extent of the diseaseThese neuroendocrine tumours occur throughout the gastrointestinal tract, most commonly in the appendix, ileum and rectum in decreasing order of frequency. Appendicular carcinoid tumours are most commonly noted as an incidental finding at appendicectomy.Carcinoid tumours arise from Kulchitsky cells at the base of intestinal crypts (of Lieberkuhn)The tumours can produce a number of vasoactive peptides, most commonly S-hydroxytryptamine (serotonin), but also histamine, prostaglandins and kallikrein.Classically, the flushing attack are induced by alcohol.The extent of disease can be assessed preoperatively using octreotide scanning, which may detect otheise clinically apparent primary and secondary tumour.