Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral reticular pattern has improved with residual is subpleural reticular opacities remaining . Bandlike linear focus of scarring or atelectasis is also noted in the left mid lung region . There are no confluent areas of consolidation . Cardiomediastinal contours are stable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Marked improvement in bilateral reticular pattern , which may reflect response of pneumonitis to steroid therapy .