Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP upright chest radiograph demonstrates an oval shaped , poorly defined opacity within the right lower lobe , new relative to examination dated ___ and ___ . Minor linear atelectasis is present at the left lung base . Cardiomediastinal and hilar contours are within normal limits . There is no pleural effusion , pneumothorax , or evidence of pulmonary edema . Imaged upper abdomen is unremarkable .
    OUTPUT:
    
Opacity within the right lower lobe which could potentially represent a early / focal pneumonia . Followup radiographs after antibiotic therapy are recommended to ensure resolution and to exclude the possibility of a lung neoplasm .