Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low and there is crowding in the bases . It is unclear if an early infiltrate could be present . The heart is mildly enlarged . The patient is status post CABG with sternal wires . The most superior wire is broken . Valve replacement is seen . There are probable small bilateral pleural effusions .
    OUTPUT:
    
Crowding at the bases . It is unclear if an early infiltrate is present or if this is all due to volume loss .