Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal portable views of the chest were obtained . Mild cardiomegaly is similar to prior , although exaggerated by low lung volumes . Lungs are clear without focal or diffuse abnormality . Blunting of the right costophrenic angle may represent an effusion although assessment is limited by soft tissue attenuation . No pneumothorax . Osseous structures are unremarkable . No radiopaque foreign body .
    OUTPUT:
    
Mild cardiomegaly . Possible right pleural effusion , although assessment is limited . PA and lateral views with better inspiration could be obtained for further evaluation .