Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright frontal images of the chest . The lungs are well expanded . A small focus of mild peribronchial infiltration is seen in the right lung base . The lungs are otherwise clear . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable . Median sternotomy wires and mediastinal clips are noted .
    OUTPUT:
    
Small focus of mild peribronchial infiltration in the right lung base . Otherwise unremarkable exam .