thymus involution during viral pneumonia

Infant with

respiratory distress. CXR AP (left) shows central airway thickening and lung hyperexpansion. The thymus is not visible. Repeat CXR AP obtained 3 months after resolution of respiratory symptoms (right) shows normal central airways and lung expansion. The thymus is now well visualized and is normal in appearance.The diagnosis was thymus involution during viral pneumonia followed by thymus rebound upon recovery.