<prompt> Answer this question truthfullyWhat information about Carcinoid syndrome is available?  <response>: <reason> Most of these tumors are found during abdominal surgery. A physical examination may show:Heart valve lesions Signs of niacin-deficiency disease pellagraTests may include:5-HIAA levels in urine Blood tests including serotonin blood test CT and MRI scan OctreoScan to identify most carcinoids and other neuroendocrine tumors 