Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are provided . Tracheostomy tube is again noted . A right perihilar mass is grossly unchanged from prior exam , difficult to accurately measure . There is mild pulmonary interstitial edema . No definite signs of pneumonia . No large effusion or pneumothorax . Cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
Mild interstitial edema . Grossly stable right perihilar mass , remains concerning for malignancy .