Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . The heart appears mildly enlarged . There is an increasing posterior basilar opacity , probably on the left and suggesting a consolidation with a pleural effusion , perhaps loculated . Although a diffuse generalized interstitial abnormality appears similar to slightly increased suggesting mild - to - moderate pulmonary vascular congestion , a more focal new left infrahilar opacity is concerning for pneumonia . There is no free air . The bones appear demineralized .
    OUTPUT:
    
Increasing left lung opacity worrisome for pneumonia . There may be a coinciding pleural effusion , potentially loculated . Background interstitial abnormality appears similar - to - mildly increased , suggesting coinciding vascular congestion .