PTA Physical Therapy Assistant

Answer: C -Percussion note is a differentiating feature between pleural effusion and hydropneumothorax.

In the case of pleural effusion, there will be a stony, dull percussion note. Whereas in hydropneumothorax, the upper will be hyperresonant and lower part of lung will show a stony, dull note.

Pain, dyspnea, and reduced chest expansion are common for both conditions.