Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Central perihilar ground - glass opacity is similar to prior and may reflect changes related to known hypersensitivity pneumonitis . No significant change from prior . No large effusion or pneumothorax . Overall cardiomediastinal silhouette is grossly stable . No acute bony abnormalities .
    OUTPUT:
    
Similar pattern of perihilar ground - glass opacity likely reflects known hypersensitivity pneumonitis . Difficult to exclude a subtle superimposed process .