Imaging studies<unk> es are often on one side and single involving posterior segments of the upper lobes and the apical segments of the lower lobes as these areas are gravity dependent when lying down. Presence of air-fluid levels implies rupture into the bronchial tree or rarely growth of gas forming organism. Laboratory studies Raised inflammatory markers (high ESR, CRP) are common but nonspecific. Examination of the coughed up mucus is important in any<unk>  infection and often reveals mixed bacterial flora. Transtracheal or transbronchial (via bronchoscopy) aspirates can also be cultured. Fiber optic bronchoscopy is often performed to exclude obstructive lesion; it also helps in bronchial drainage of pus. File:Pulmonaryabs.Pulmonary<unk>  on CT scan File:PulmonaryabsCXR.Pulmonary<unk>  on CXR File:Abscess.Pathology image of a<unk> . File:Abscess, subpleural (3791075019).alt=A subpleural<unk> .|A subpleural<unk> .
Lung abscess
Pleural empyema
Lobar pneumonia
Pleurisy
Mediastinitis
Malignant pleural effusion
Hydrothorax
Bronchitis kettle