Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 2 .5 CM RETROCARDIAC OPACITY SEEN ON THE LATERAL VIEW INTERPOSED BETWEEN THE POSTERIOR WALL OF THE LEFT VENTRICLE AND THE SPINE WAS ALSO PRESENT ON CHEST RADIOGRAPH PERFORMED ___ , BUT A SUBSEQUENT CHEST CT SCAN ON ___ ___ SHOWS THAT THERE IS NO LUNG NODULE OR SIGNIFICANT ABNORMALITY . THIS IS PRESUMABLY A PULMONARY VEIN SEEN IN PARTIAL CROSS SECTION . LUNGS ARE CLEAR . No pleural effusion or pneumothorax . Severe cardiomegaly is unchanged . There is mild pulmonary vascular engorgement . MEDIASTINAL AND hilar silhouettes are WISE unremarkable .
    OUTPUT:
    
Mild pulmonary vascular congestion without overt edema . CHRONIC SEVERE CARDIOMEGALY