bronchogenic carcinoma, one of the more than 90% of malignant lung tumors that originate in bronchi. Lesions, usually resulting from cigarette smoking, may cause coughing and wheezing, fatigue, chest tightness, and aching joints. In the late stages, bloody sputum, clubbing of the fingers, weight loss, and pleural effusion may be present. Diagnosis is made by bronchoscopy, sputum cytological examination, lymph node biopsy, radioisotope scanning procedures, or exploratory surgery. Surgery is the most effective treatment, but well over 50% of cases are unresectable when first detected. Palliative treatment includes radiotherapy and chemotherapy.
