Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP chest radiograph demonstrates hyperinflated lungs and flattening of bilateral diaphragms . Lucency within the upper lobes in addition to aforementioned findings are consistent with dense emphysematous changes as previously identified . Heart size is enlarged , present on prior examination and stable . No evidence of pulmonary edema . No focal opacity convincing for pneumonia is identified . There is no pleural effusion . Osseous structures are without acute abnormality .
    OUTPUT:
    
Emphysema and cardiomegaly without focal opacity convincing for pneumonia .