Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Possible hyperinflation and flattened diaphragms , which could reflect presence of COPD . The heart is not enlarged . There is upper zone redistribution , without other evidence of CHF . No focal infiltrate or effusion is identified . No focal opacities to suggest aspiration pneumonitis . Within the limits of plain film radiography , no hilar or mediastinal lymphadenopathy or pulmonary nodule is detected . No pneumothorax detected . Incidental note is made of shallow concavities with sclerotic borders seen along the inferior edge of the medial clavicles , right greater the left , representing normal variant rhomboid fossae . Incidental note made of ossification of the apparent opacification of the right renal collecting system likely related to CT angiogram obtained immediately prior .
    OUTPUT:
    
No acute pulmonary process identified . No evidence of pneumonic infiltrate or aspiration pneumonitis . No radiographic evidence of malignancy . Possible hyperinflation , suggestive of background COPD .