Paralysis of the left hemidiaphragm on chest computed tomography

(A) Coronal CT image of the chest shows marked elevation of the left hemidiaphragm with associated mild compressive atelectasis at the lung base (arrow).
(B) CT image of upper abdomen demonstrates normal right crus and marked atrophy of the left crus (dashed arrows; note difference in thickness of the left hemidiaphragm compared with the right).