A 21-year-old woman underwent correction of congenital thoracic kyphos
coliosis. The procedure was completed in two stages. The first stage i
nvolved light thoracotomy and anterior vertebrectomy. Following positi
onal obstruction of her right-sided chest drain she developed a very l
arge, left-sided pneumothorax in the immediate postoperative period. N
o attempt at central venous line placement had been made on the left s
ide. Breach of the midline at vertebrectomy may allow pleural gas to c
ross and cause a contralateral pneumothorax.