Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: At the medial right lung base , there is a subtle increased opacity , which could represent crowded bronchovascular markings . No overt pneumonia or edema . Atelectasis identified in the bilateral lower lungs . Cardiomediastinal and hilar contours appear similar to the prior study .
    OUTPUT:
    
At the medial right lung base , there is a subtle increased opacity , which could represent crowded bronchovascular markings . No overt pneumonia or edema .