Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior film , the patchy opacity previously seen left mid zone is slightly improved . Retrocardiac opacity , obscuration of the left hemidiaphragm consistent with left lower lobe collapse and / or consolidation , and small left effusion are similar . The left pleural effusion could be slightly decreased in the interval . There is prominent vascular plethora presumably reflecting CHF , though the appearance raises the possibility of some background parenchymal scarring . Small focal , peripheral , patchy opacities at the right base laterally are noted , similar prior . Minimal blunting of the right costophrenic angle is consistent with a small right effusion . Cardiomediastinal silhouette is unchanged . Again seen is a left PICC line , with tip overlying the mid SVC . No pneumothorax is identified .
    OUTPUT:
    
Persistent left lower lobe collapse and / or consolidation and small left effusion , though previously seen left mid zone patchy opacity is improved . Probable CHF , which appears slightly worse . Question background parenchymal scarring . Small focal peripheral opacities at the right lung base , of uncertain etiology or significance , but unchanged compared with the prior film . These likely correspond to findings on the chest CT from ___ . They presumably represent some form of infectious infiltrate . Peripheral location is suggestive of an embolic phenomenon such as septic emboli .