Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an opacity in the left retrocardiac region , slightly more conspicuous than on ___ . There is no pleural effusion or pneumothorax . The cardiac silhouette is mildly enlarged , unchanged from priors . There is a 16 mm nodule in the right upper lung not visualized on priors as well as more conspicuous left upper lung nodular opacity .
    OUTPUT:
    
1 . Opacity in the left retrocardiac region compatible with pneumonia in the proper clinical setting . 2 . 16 mm nodule in the right upper lung not visualized on priors . Follow - up after patient 's acute present patient suggested to ensure resolution versus further evaluation with CT is recommended .