Bronchopleural fistula usually associated with chronic empyema after lung operations continues to occur in modern surgical practice. Successful treatment depends to a large extent on adequate dependent drainage of the empyema space. Tube thoracostomy, although useful initially, is unacceptable as long-term treatment. Window thoracostomy as currently performed is effective but unnecessarily extensive. We describe a simpler procedure, triangular window thoracostomy, for use as a permanent pleurocutaneous stoma or as an interim measure before definitive surgical treatment.