Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are increased interstitial markings bilaterally consistent with mild to moderate interstitial edema , versus atypical infection . No large pleural effusion is seen . There is no pneumothorax . The cardiac silhouette is moderately enlarged . The aorta is calcified and tortuous . Degenerative changes are seen along the spine .
    OUTPUT:
    
Increased interstitial markings bilaterally may be due to interstitial edema , chronic lung disease given history of smoking , versus atypical infection ; no priors available for comparison . Cardiomegaly . No large pleural effusion .