Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior study , minimal blunting of both costophrenic angles remains visible , but is grossly unchanged . Cardiomediastinal silhouette is unchanged allowing for technical differences . Sternotomy wires and mitral valve again noted . The left pulmonary artery appears prominent , with a tapered appearance , which could reflect pulmonary hypertension . The right pulmonary artery is likely obscured due to overlying structures . There is borderline upper zone redistribution , without overt CHF . Again seen is retrocardiac opacity consistent with left lower lobe collapse and there subsegmental atelectasis at the right lung base . Left convex scoliosis of the upper thoracic spine , with a rotary component , is again noted .
    OUTPUT:
    
No significant change compared with 1 day earlier . Small bilateral effusions , left lower lobe collapse and / or consolidation , and subsegmental atelectasis at the right lung base are similar to the prior study .