Carcinoid Tumors, Intestinal, also known as gastrointestinal carcinoid tumor, is related to appendix carcinoid tumor and pulmonary blastoma. An important gene associated with Carcinoid Tumors, Intestinal is SDHD (Succinate Dehydrogenase Complex Subunit D), and among its related pathways/superpathways is Neuroscience. The drugs Histamine and Cyproheptadine have been mentioned in the context of this disorder. Affiliated tissues include small intestine and appendix, and related phenotypes are intestinal carcinoid and neoplasm