Which condition would likely present with hyperresonance upon percussion?

• A. Atelectasis
• B. Pneumothorax
• C. Pneumonia
• D. Viral bronchitis

Answer: (B)

Hyperresonance upon percussion is typically associated with the presence of excess air in the pleural space or lung tissue, which reduces the density of the area being percussed. In the context of the options provided, pneumothorax is characterized by an accumulation of air in the pleural cavity, causing the affected side of the chest to sound more resonant when tapped. This is because the air-filled pleural space creates a sound that is lower in pitch and higher in intensity compared to normal lung tissue or fluid-filled areas.

In contrast, conditions like atelectasis, pneumonia, or viral bronchitis generally lead to decreased air content or increased fluid density in the lungs, resulting in dullness or a more muted sound on percussion. Atelectasis involves the collapse of lung tissue, which would present with decreased resonance. Pneumonia typically involves consolidation, leading to a denser, dull sound. Viral bronchitis, while it may not always present with significant consolidation, usually does not cause hyperresonance either.

Thus, pneumothorax stands out as the condition most likely to demonstrate hyperresonance upon percussion due to the presence of air in the pleural space.