Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower on the frontal exam when compared to prior . There is secondary crowding of the bronchovascular markings particular in the perihilar region . On the lateral view , lungs are clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Perihilar opacities on the frontal view which may be due to crowding in the setting of low lung volumes . Infection would be difficult to entirely exclude . Consider repeat exam with improved inspiratory effort if further clarification if desired .