Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest are compared to previous exam from ___ . Again low lung volumes are seen . The lungs , however , are clear of consolidation . There is no effusion . Increased opacity projecting over left upper lung is compatible with asymmetric degenerative changes at the costochondral junction of the first rib which is more clearly delineated on prior exam secondary to different technique . Cardiomediastinal silhouette is within normal limits . Osseous and soft tissue structures are otherwise unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .