Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears mildly enlarged . Although with distinct contours , upper zone pulmonary vessels are relatively large suggesting pulmonary venous hypertension and there are probably mild congestive changes . There is no pleural effusion or pneumothorax . No focal opacities are demonstrated .
    OUTPUT:
    
Mild venous distention , possibly mild vascular congestion . Mild cardiomegaly .