Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The mediastinal contours are within normal limits . Increased interstitial markings bilaterally are noted , with crowding of the bronchovascular structures , which may suggest atelectasis , mild pulmonary vascular congestion , or possibly an atypical infectious process . No overt pulmonary edema is seen . No pleural effusion or pneumothorax is identified . No areas of focal consolidation are present . There are mild degenerative changes within the imaged thoracolumbar spine .
    OUTPUT:
    
Increased interstitial markings most pronounced at the lung bases , which are nonspecific and may reflect atelectatic changes but mild pulmonary vascular congestion , or an atypical infection are not excluded . No overt pulmonary edema is seen . A repeat radiograph with improved inspiratory effort may be helpful for further evaluation .