Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Postoperative mediastinum and mild cardiomegaly is unchanged from prior exam . Hilar contours are normal . A heterogenous density in the posterior right lower lobe is worrisome for pneumonia . The left lung is clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Heterogenous right posterior lower lobe opacity worrisome for pneumonia . Results were discussed over the telephone with Dr . ___ by Dr . ___ at 11 :32 a .m . on ___ at time of initial review .