<prompt> Commonest cause of lung abscess isAspirationHematogenous spread from distant dateDirect contactLymphatic spread  <response>: Lung abscess Lung abscess refers to a microbial infection of the lung that results in necrosis of the pulmonary parenchyma MC cause of primary lung abscess : Anaerobic bacteria Etiology of anaerobic lung abscess : Aspiration Routes of infection Aspiration of organisms that colonize oropharynx MC Inhalation of infection or aerosols Hematogenous dissemination from extrapulmonary site Direct inoculation as in tracheal intubation or stab wounds Contiguous spread from an adjacent site of infection Ref: schwazs principle of surgery 10th edition Pgno : 650 