[khanar]

Commonly tested in USMLE when you will be presented with an audio file that sounds like the attached MP3 file below.

This is pleural friction rub and the causes are;

• Pulmonary embolism
• Bacterial pneumonia
• Tuberculosis
• Pleurisy
• Previous thoracic surgery
• SLE
• Lung cancer
• Asbestosis
• Radiation therapy