Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate the patient is status post median sternotomy . Heart size is enlarged within prominent central vasculature and cephalization consistent with vascular congestion . There is flattening of the left hemidiaphragm , stable in appearance since prior examinations . No focal opacity is identified .
    OUTPUT:
    
Mild cardiomegaly with vascular congestion .