Completion pneumonectomy refers to an operation intent to remove what is left of a lung partially resevted during previous operation. According to current medical literature, it carriesa higher risk of operative mortality and morbidity than does standard pneumonectomy. Over the past 5 years, 18 consecutive patients aged 10 to 50 years underwent completion pneumonectomy. Indications for completion pneumonectomy were second lung cancer in one patient, pulmonary lenfoma in 1 patient, and benign pulmonary disease in the other 16 patients. The mean interval between the first operation and completion pneumonectomy was 4 years. 30 day operative nortality was 11%(two cases). This rate was higher for patients with benign pulmonary disease (12.5%). All patients with postoperative major complications had benign pulmonary disease (especially tuberculosis). These results suggest that completion pneumonectomy can be done with an operative risk similar to the standard pneumonectomy. The bronchial stump should be reinforced by viable intercostal muscle flap to prevent major complications.