Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright radiograph was obtained . The lungs are somewhat low in volume with increased left basal opacity which may reflect atelectasis given the low lung volumes , though component of aspiration or pneumonia could be considered in the appropriate clinical setting . No pleural effusion is seen . Heart size is top normal with normal cardiomediastinal contours . Diffuse sclerosis of the osseous structures is compatible with metastases .
    OUTPUT:
    
Increased left basal opacity may reflect developing pneumonia .