<prompt> Klebsiella pneumonia has all of the following characteristics except:Upper lobes are frequently involvedPneumatocele may occur commonlyEmpyema is much more commonLung abscess formation is very uncommon  <response>: Klebsiella pneumonia :- is common in alcoholics and immunocompromised patients presents as an upper lobe involvement CT chest shows poorly marginated lowly attenuated areas with and without small air-containing cavities called as pneumatoceles. Pulmonary necrosis, pleural effusion and empyema can occur with disease progression.So,Lung abscess is common in these pts. CXR :- shows Homogenous non-segmental lobar consolidation showing Bulging fissure sign and lung abscess in 50 of cases. 