Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were provided . There is a hazy opacity located peripherally within the right upper lobe , consistent with pneumonia . Subtle opacity near the right lower lobe may represent infection as well . There is no pleural effusion or pneumothorax . There is no evidence of pulmonary edema . A prosthetic valve is unchanged in position . Cardiomediastinal silhouette is stable . Median sternotomy wires are intact .
    OUTPUT:
    
Right upper lobe pneumonia with possible involvement of the lower lobe as well .