An area of hyporesonance on one side of the chest may indicate which condition?

• A. Pneumothorax
• B. Pneumonia
• C. Atelectasis
• D. Hemothorax

Answer: (D)

Percussion findings reflect what’s in the chest. A hyporesonant (dull) area on one side suggests there is something fluid-filled or solid taking up space there, such as a pleural effusion or collapsed lung. A hemothorax fits this well because blood in the pleural space dulls the sound when you tap over that region and typically comes with reduced breath sounds on that side.

Pneumothorax would usually produce a hyperresonant (louder, air-filled) note, not dullness. Pneumonia or atelectasis can also cause dullness due to consolidation or volume loss, but the hallmark in this scenario most consistent with a localized dull area due to a pleural space process is a hemothorax.