Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are compared to previous exam from ___ and ___ . There is patchy opacity projecting over the heart on the frontal view , not seen on the lateral . In conjunction with older films this is thought to be related to costochondral calcification . The lungs are hyperinflated but otherwise clear . There is no evidence of pulmonary vascular congestion . Cardiomediastinal silhouette is stable , noting post-operative changes from median sternotomy and mediastinal clips and dual - lead pacing device in stable position . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
Hyperinflation without evidence of acute cardiopulmonary process .