Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac and mediastinal silhouettes are stable . No lobar consolidation is seen . There is subtle increased interstitial markings in the left mid lung zone , with possible mild peribronchial thickening . No pleural effusion or pneumothorax is seen . There is persistent compression of a mid thoracic vertebral body .
    OUTPUT:
    
Slight increase in interstitial markings in the left mid lung zone which may in part relate to peribronchial thickening although atypical infection not excluded . The remainder of the study is unchanged .