Toddler who is post-op from cardiac surgery with respiratory distress

CXR and US of diaphragm paralysis
CXR AP (above) shows elevation of the left hemidiaphragm. Sagittal M-mode US of the right hemidiaphragm (lower left) shows normal sinuous motion of the right hemidiaphragm while sagittal M-mode US of the left hemidiaphragm (lower right) shows no motion of the left hemidiaphragm.

The diagnosis was paralysis of the left hemidiaphragm.