Do bullae indicate a predisposition to recurrent pneumothorax?

A relationship between idiopathic spontaneous pneumothorax (ISP) and visibl e parenchymal bullae and blebs has been reported. The causal relationship b etween blebs and bullae and ISP is questionable. Consequently, resection of the involved area is only indicated if it predisposes to recurrence of the pneumothorax. CT studies on 101 cases of ISP were analysed. The presence o f bullae and their distribution was then related to the first and recurrent pneumothorax. CT demonstrated bullae in 56% of first ISP and in 64% of rec urrent ISP, mostly among older patients. Only eight patients had bullae lar ger than 2 cm on the side of the pneumothorax. The location of the bullae w as not a factor in predicting recurrent pneumothorax.