Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate ill - defined subtle opacification at the lung bases . The cardiomediastinal and hilar contours are normal . There is no pneumothorax or pleural effusion . Pleural surfaces are unremarkable .
    OUTPUT:
    
Subtle ill - defined opacities at the lung bases , which may reflect areas of atelectasis but are consistent with the radiologic appearance of a viral or mycoplasma pneumonia . Recommend 4 week followup after treatment is completed to assess for resolution . Findings were discussed with Dr . ___ ___ the telephone by Dr . ___ on ___ at 15 : 50 , ___ min after findings were made .