Carcinoid
Carcinoids, also known as carcinoid tumors, are a group of new organisms that occur in the pheochromocytes of the gastrointestinal tract and other organs. Their clinical, histochemical, and biochemical characteristics can vary depending on where they occur. This kind of tumor can secrete biologically active factors such as serotonin (serotonin), kinins, histamine, and cause vascular movement disorders, gastrointestinal symptoms, heart and lung diseases, etc., known as carcinoid syndrome ).
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