Q: What is folded lung syndrome? 

 Answer: It is the other name of rounded atelectasis. As an outer portion of the lung slowly collapses as a result of scarring and shrinkage of the pleura, it produces a rounded appearance on x-ray. It may give apperance of a mass or tumor. Rounded atelectasis is usually a complication of asbestos-induced disease of the pleura, but it may also result from other types of chronic scarring and thickening of the pleura.