Signs and symptoms
Signs and symptoms of carcinoid tumors vary greatly and depend on the tumor location and size as well as on the presence of metastases. Findings range from no tumor-related symptoms (most carcinoid tumors) to full symptoms of carcinoid syndrome (primarily in adults). Due to their vague and intermittent symptoms, diagnosis of carcinoid tumors may be delayed, especially in children, in whom the tumor is rare and the diagnosis is unexpected.