Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was provided . Lung volumes are low . Patient 's kyphotic positioning causes the chin to obscure the lung apices . Diffuse interstitial opacity with a basilar predominance raises concern for pulmonary fibrosis . Heart size is difficult to accurately assess . The mediastinal contour appears unremarkable . No large pneumothorax . Bony structures appear intact .
    OUTPUT:
    
Basilar predominant interstitial opacity concerning for pulmonary fibrosis . Recommend correlation with prior imaging if available to confirm . If no prior studies are available , consider high - resolution CT of the chest to further evaluate .