Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP portable chest radiograph was obtained . Right upper lung opacity is slightly more evident than on the previous examination . Otherwise the lungs are low in volume giving the appearance of bronchovascular crowding with mild pulmonary vascular congestion but no overt edema . Linear retrocardiac opacity could reflect atelectasis . There is no pleural effusion or pneumothorax . The heart is top - normal in size with tortuous thoracic aortic contour .
    OUTPUT:
    
Persistent right upper lobe opacity could be due to recurrent or residual infectious process though neoplastic entities are not excluded . As such , followup chest CT as recommended on the previous chest CT in 2 months is recommended after appropriate antibiotic therapy .