Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes . The right lung base opacity is new since prior . No pleural effusion is seen . Mild vascular congestion is new . Hilar and mediastinal silhouettes are unchanged . The heart is mildly enlarged . The left lung is essentially clear . There is no pneumothorax or pleural effusion . The patient is status post median sternotomy . Right ventricular pacer lead is in unchanged position .
    OUTPUT:
    
Probable RLL pneumonia . New borderline cardiac decompensation .