Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal AP and lateral views of the chest were obtained . Low lung volumes result in bronchovascular crowding . There is no focal consolidation , pleural effusion or pneumothorax . Mild bibasilar atelectasis is seen . Pulmonary vasculature is engorged peripherally , hilar arteries are dilated , but there is no pulmonary edema . Moderate cardiomegaly is substantially due to left atrial enlargement . Mediastinal silhouette is normal .
    OUTPUT:
    
No pneumonia . Pulmonary vascular congestion , probable pulmonary hypertension , and severe left atrial enlargement point to mitral valve pathology .