Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A wedge - shaped left lower lobe opacity in the retrocardiac region is slightly decreased in size compared to chest radiograph of ___ , and is accompanied by adjacent linear opacity extending to the lung periphery . Minimal blunting of left costophrenic sulcus is unchanged and probably reflects pleural thickening . Right lung and right pleural surfaces are clear , and cardiomediastinal contours are normal . Scoliosis is incidentally noted .
    OUTPUT:
    
Left lower lobe parenchymal abnormalities are likely the sequela of previous necrotizing left lower lobe pneumonia . However , if the patient is experiencing recurrent infections or recent respiratory symptoms , CT may be considered to more fully evaluate the lung parenchyma and airways in this region if warranted clinically .