Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate a wedge - shaped opacity in the periphery of the left upper lobe , similar in appearance to ___ but more conspicuous on today 's examination . This may represent an area of infarction or recurrent pneumonia . The lungs are otherwise clear without pleural effusion or pneumothorax . No pulmonary vascular congestion is detected . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Left upper lobe peripheral opacity possibly representing recurrent infection or infarction , more conspicuous but similar in appearance to ___ .