Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable semi upright view of the chest . Cardiomegaly is unchanged . Mediastinal prominence may reflect portable AP technique . Lungs appear grossly clear allowing for suboptimal inspiratory effort . Retrocardiac space is poorly assessed without lateral projection . No acute bony abnormalities .
    OUTPUT:
    
Limited exam without convincing signs of pneumonia or edema . Mediastinal prominence may reflect portable technique .