Objective: Bronchopleural fistula after pneumonectomy is a very serious complication, occurring in 1-4% of cases, regardless of the bronchial stump closure technique adopted. The objective of this study was to report a bronchial stump closure technique in pneumonectomy by manual suture (polypropylene running suture) and to study the incidence of bronchopleural fistula. Methods: Between January 1988 and December 1997, 209 patients (186 men and 23 women, mean age = 60.5 years) were operated by the same operator. The indication for surgery was lung cancer in all cases. Results: The incidence of bronchopleural fistula was 2.4%; four fistulas during the first postoperative month and another occurred at 6 months; four were located on the left side and one was situated on the right. The bronchial stump was covered in only two of these five cases; 40% died of this complication. Neoadjuvant treatment (chemotherapy and/or radiotherapy) was found to increase the risk of development of bronchopleural fistula (40% vs. 7.2%) and this difference was statistically significant (P = 0.046). Conclusions: Manual closure of the bronchial stump by running suture, performed on an open bronchus, is a reliable technique with a low incidence of bronchopleural fistula. Those results could be further improved by systematically covering the right and the left bronchial stumps. (C) 1999 Published by Elsevier Science B.V. All rights reserved.