Enlargement of the cardiac silhouette

Enlargement of the cardiac silhouette on a frontal (or PA) chest x-ray can be due to a number of causes 1:

Recognising enlargement relies upon an understanding of the normal cardiomediastinal outline and normal cardiothoracic ratio


Chest x-ray
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Article Information

rID: 15282
System: Chest
Sections: Gamuts, Approach
Synonyms or Alternate Spellings:
  • Increased cardiothoracic ratio
  • Enlargement of the pericardial silhouette

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    Case 1: with pericardial effusion
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    Case 2: cardiomegaly
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