Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to ___ , the right perihilar heterogeneous opacity has minimally improved and could represent residual edema or pneumonia . There is mild vascular congestion . Mild cardiomegaly is stable . No pleural effusion . No pneumothorax . Right PIC line terminates at the cavoatrial junction .
    OUTPUT:
    
Questionable right perihilar residual edema or small pneumonia , minimally improved from ___ . Mild vascular congestion . Stable mild cardiomegaly .