Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and 2 lateral chest radiographs were obtained . A gradient of opacity from right to left is most likely due to asymmetric soft tissue attenuation . There may be a component of right pleural effusion . There is no focal consolidation or pneumothorax . Cardiomegaly is unchanged .
    OUTPUT:
    
No definite abnormality .