Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are compared to previous exam from ___ . Since prior , there has been improvement of a left basilar opacity which still partially persists . The lungs are otherwise clear . There is no pneumothorax . Cardiomediastinal silhouette is unchanged . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
Interval improvement of a left basilar opacity since prior with possible residual atelectasis versus resolving infiltrate . Otherwise , unremarkable exam .