Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size with a left ventricular configuration . There is mild unfolding of the thoracic aorta . Otherwise , the mediastinal and hilar contours are unremarkable . There is a mild generalized interstitial process . Differential considerations include mild pulmonary vascular congestion versus atypical pneumonia in the appropriate clinical setting . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mild interstitial abnormality ; differential considerations include mild vascular congestion or atypical infection .