Empyema also known as pyothorax,pleural empyema and purulent pleuritis.
Empyema is collection of pus in pleural space (space between lungs and the inner sufcace of chest wall)

Risk factors :

•Bacterial pneumonia.

•Chest surgery.

•Lung abscess.

•Trauma or injury to the chest.

Symptoms :

•Chest pain.

•Dry cough.

•Excessive sweating, especially night sweats.

•Fever and chills.

•General discomfort, uneasiness, or ill feeling (malaise).

•Shortness of breath.

•Weight loss (unintentional).