Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Degree of cardiomegaly is unchanged from prior . Prosthetic valves and median sternotomy wires are again noted . There is hazy right basilar opacity which is new since prior , seen posteriorly on the lateral view . This could be a posteriorly loculated effusion versus focal parenchymal opacity . Elsewhere , lungs are clear . There is no overt pulmonary edema . No acute osseous abnormalities .
    OUTPUT:
    
Right basilar opacity which may be due to posteriorly loculated effusion noting that underlying parenchymal consolidation is also possible .