Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left costophrenic angle is incompletely imaged on frontal view . No focal consolidation , pleural effusion , or pneumothorax is seen . Mild interstitial prominence is likely chronic , most commonly due to smoking or other respiratory irritant . Heart and mediastinal contours are within normal limits .
    OUTPUT:
    
Mild interstitial abnormality , probably not related to the patient 's acute chest pain .