Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP view of the chest . As on prior , there are diffusely increased interstitial markings throughout the lungs suggesting chronic process . There is subtle increased opacity in the mid lung zones bilaterally as well as patchy consolidation at the left lung base . Cardiomediastinal silhouette is stable . No acute osseous abnormality detected .
    OUTPUT:
    
Evidence of chronic underlying lung disease with possible superimposed acute process in the bilateral mid lung zones and left lung base . Clinical correlation suggested .