Thymus Rebound

  • Etiology: thymus shrinks due to stress + infection, returns to normal size when well
  • Imaging: thymus disappears, then reappears but stops growing when it reaches its normal size
  • DDX: recurrent tumor in a patient with an anterior mediastinal tumor

Cases of Thymus Rebound

CXR of thymic rebound
CXR AP from one month ago (left) shows evidence of a right lower lobe infiltrate and right pleural effusion due to bacterial pneumonia. The superior mediastinum is narrow. CXR AP taken today (right) shows resolution of the pneumonia and interval reappearance of the thymus.