Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a diffuse bilateral interstitial thickening , with increased vascular markings and upper re-distribution . There is a more confluent opacity in the right lung base . There is a small right - sided pleural effusion and fluid tracking along the major fissure of the right lung , better seen in the lateral view . Cardiomediastinal and hilar contours are unremarkable . There is no pneumothorax . Aorta is mildly tortuous .
    OUTPUT:
    
Increased interstitial marking may be due to fluid overload . Superimposed infectious process not excluded . More confluent opacity in the right lung base might be secondary to summation of structures although consolidation is not excluded .