Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . A small nodular opacity in the left upper lung is not well seen on previous radiographs . Hila and cardiomediastinal contours and pleural surfaces are normal . The alternating bands of sclerosis and lucency in the vertebral bodies of the spine suggest renal osteodystrophy .
    OUTPUT:
    
1 . Left upper lung nodular opacity could represent overlapping osseous and vascular structures or a pulmonary nodule . Apical lordotic chest radiographic views are recommended to clarify . 2 . Likely renal osteodystrophy .