Which physical examination finding is most consistent with a pleural effusion on chest imaging?

Which physical examination finding is most consistent with a pleural effusion on chest imaging?

• A. Hyperresonance
• B. Increased fremitus
• C. Dullness to percussion
• D. Bronchial breath sounds

Answer: (C)

When fluid collects in the pleural space, it muffles sound transmission and dampens lung vibrations. Percussion over the area where the fluid sits becomes dull because fluid conducts sound differently than air-filled lung tissue. The fluid layer also separates the lung from the chest wall, reducing tactile fremitus, so you feel less vibration when you say "99" or "to-vibrate." Lung sounds at the base are typically decreased or absent with an effusion, whereas bronchial breath sounds imply consolidation rather than a fluid collection. Hyperresonance points to air (as in pneumothorax or emphysema) and isn’t characteristic of a pleural effusion. Therefore, dullness to percussion best matches pleural effusion on imaging.

When fluid collects in the pleural space, it muffles sound transmission and dampens lung vibrations. Percussion over the area where the fluid sits becomes dull because fluid conducts sound differently than air-filled lung tissue. The fluid layer also separates the lung from the chest wall, reducing tactile fremitus, so you feel less vibration when you say "99" or "to-vibrate." Lung sounds at the base are typically decreased or absent with an effusion, whereas bronchial breath sounds imply consolidation rather than a fluid collection. Hyperresonance points to air (as in pneumothorax or emphysema) and isn’t characteristic of a pleural effusion. Therefore, dullness to percussion best matches pleural effusion on imaging.