Bronchial Carcinoid By Robert L Keith, MD, Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado School of Medicine Reviewed / Revised May 2023 View Patient Education Diagnosis Treatment Bronchial carcinoids are rare (1 to 2% of all lung cancers in adults), slow-growing, neuroendocrine tumors arising from bronchial mucosa; they affect patients in their 40s to 60s.