The image of the round atelectasis in the transverse plane: a CT study.

Computerized tomography (CT) was performed on 6 patients presenting a round atelectasis of the lung. It showed that the image of the round atelectasis in the transverse plane is specific and has analogous characteristics to the image produced in conventional tomography. CT scanning showed that more lung segments were involved in the collapse than was suggested by conventional tomography. The restrictive nature of the round atelectasis was evident on the CT scan.