Which finding is most characteristic of pleural effusion compared with pneumonia?

• A. Decreased fremitus
• B. Crackles
• C. Increased fremitus
• D. Wheezes

Answer: (A)

Tactile fremitus is the vibrations you feel when the patient speaks. In pneumonia, the lung tissue becomes consolidated and conducts these vibrations more easily, so fremitus increases. In pleural effusion, fluid in the space between the lung and chest wall dampens and blocks those vibrations, leading to decreased fremitus. That dampening effect is why decreased fremitus is the finding that best distinguishes pleural effusion from pneumonia.

Context: pneumonia often presents with crackles and louder breath sounds over the affected area due to airways and alveolar involvement, whereas pleural effusion typically produces reduced or absent breath sounds over the effusion with dullness to percussion.