<unk>  is a type of liquefactive necrosis of the<unk>  tissue and formation of cavities (more than 2 cm) containing necrotic debris or fluid caused by microbial infection. This pus-filled cavity is often caused by aspiration, which may occur during anesthesia, sedation, or unconsciousness from injury. Alcoholism is the most common condition predisposing to<unk> es.<unk>  is considered primary (60%) when it results from existing<unk>  parenchymal process and is termed secondary when it complicates another process e.g. vascular emboli or follows rupture of extrapulmonary<unk>  into<unk> .
Lung abscess
Pleural empyema
Lobar pneumonia
Pleurisy
Mediastinitis
Malignant pleural effusion
Hydrothorax
Bronchitis kettle