Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior chest radiograph performed 2 days earlier , there has been no significant interval change . An ill - defined left perihilar opacity persists , and may represent pneumonia in the setting of infectious symptoms . However , underlying malignancy or metastases are also on the differential , particularly given slightly nodular appearance on the prior CXR . Remainder of the lungs are otherwise clear . No pleural effusion or pneumothorax . Cardiomediastinal silhouette is normal . There is mild dextrocurvature of the lower thoracic spine . Surgical clips project over the right breast .
    OUTPUT:
    
Left perihilar opacity previously appeared slightly nodular , which may represent pneumonia . However , further evaluation with CT is recommended to exclude underlying malignancy or metastases .