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Chest X-Ray
 
 

Costophrenic Angles

 
 
 
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Costophrenic Blunting

  • Look For

  • Loss of the normally sharp angle between the diaphragm and the chest wall laterally.
  • Significance

  • A sign of small pleural effusion.
Isolated costophrenic blunting without other signs of pleural effusion is estimated to represent approximately 300mL of pleural fluid.
  • Example

  • Bibasal costophrenic blunting in a patient with small bilateral pleural effusions
  • No Overlay
    Overlay
    Bibasal costophrenic blunting in a patient with small bilateral pleural effusions
     

Deep Sulcus Sign

  • Look For

  • An abnormally sharp costophrenic angle with a deep, sharp sulcus on a supine chest x-ray.
  • Significance

  • A sign of pneumothorax.
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