Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest when compared to prior , there has been no significant interval change . Increased interstitial markings at the bases are present although somewhat less conspicuous on today 's exam and are likely chronic . Superiorly , the lungs are clear . The cardiomediastinal silhouette is normal . No acute osseous abnormality is identified .
    OUTPUT:
    
No definite acute cardiopulmonary process . Increased interstitial markings persist on the left at the base which may be chronic .