Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were performed . The heart is mild to moderately enlarged , unchanged . Prominent and asymmetric interstitial opacities appear improved from the most recent study but similar to ___ . A worsened appearance of the chest from ___ is worrisome for progressive and severe fibrosis , however , a component of acute reaction to drug use can not be excluded . The azygous vein is not enalarged and there are no pleural effusions to think this worsening is primarily related to volume overload . The mediastinal and hilar structures are normal . There are no acute osseous abnormalities .
    OUTPUT:
    
Prominent interstitial opacities which appear worse from ___ are thought to reflect a path to severe fibrosis , however , this could partially be explained by an acute reaction from recent drug use . No convincing evidence for volume overload .