Quad sign

The quad sign is a static sonographic sign observed in pleural effusion. It consists of four lines representing the pleural, rib, fluid and lung. Similar to the sinusoid sign, this sign has a high sensitivity and specificity for pleural effusion, which is anechoic in itself.

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Article Information

rID: 30807
System: Chest
Section: Signs
Synonyms or Alternate Spellings:

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