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Test Findings
 
 

Silhouette Signs

 
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Overview

  • Look For

  • Obliteration of normally clear outlines between the lung fields and adjacent structures such as the heart, aorta or hemidiaphragm.
  • Significance

  • Loss of normal borders appears when the adjacent area of lung is consolidated or collapsed.
  • Interpretation

  • Upper right heart border / ascending aorta - anterior right upper lobe
  • Upper left heart border - anterior left upper lobe
  • Aortic knob / arch - apical left upper lobe
  • Right heart border - right middle lobe
  • Left heart border - lingular lobe
  • Anterior hemidiaphragms - lung bases / lower lobes
  • Examples

  • Obscuration of the right hemidiaphragm suggesting right lower lobe consolidation
  • Obscuration of the right hemidiaphragm suggesting right lower lobe consolidation
     
  • Obscuration of the left hemidiaphragm suggesting right lower lobe consolidation
  • Obscuration of the left hemidiaphragm suggesting right lower lobe consolidation
     
  • Obscuration of the ascending aorta, suggesting right upper lobe consolidation
  • Obscuration of the ascending aorta, suggesting right upper lobe consolidation
     
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