Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again , there are diffuse interstitial abnormalities , with an upper lobe predominance . They are not significantly changed from the prior chest radiograph or CT . There is no new opacity . There is no pulmonary edema , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Unchanged diffuse interstitial abnormality . The differential diagnosis includes hypersensitivity pneumonitis or early fibrosis . Although PCP infection is less likely , it would be a consideration if the patient is HIV positive . If further evaluation is clinically warranted , could obtain a repeat CT of the chest with thin section reformats . Results were discussed with Dr . ___ at 5 p .m . ___ via telephone by Dr . ___ at the time the findings were discovered .