Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A venous catheter terminates in the lower superior vena cava . The cardiomediastinal and hilar contours are stable , with mild cardiomegaly . There is no longer a mild diffuse interstitial abnormality but persistent opacities are noted at the lung bases with reticulation ; scarring or interstitial lung disease could be considered .
    OUTPUT:
    
No definite acute process . Findings raising concern for possible underlying mild interstitial disease at the lung bases versus persistent scarring or atelectasis .