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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