Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A large pad projects over the left mid and lower lung fields , limiting evaluation . Within this limitation , no focal consolidation , pleural effusion , pneumothorax , or pulmonary edema is detected . Heart size is mildly enlarged . Aortic knob calcifications are noted .
    OUTPUT:
    
Limited study demonstrating mild cardiomegaly without radiographic evidence for acute pulmonary process .