Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Exam is limited by patient 's inability to cooperate and the lateral view is nondiagnostic . Stable prominence of the interstitium likely due to reported history of COPD . No focal opacification concerning for pneumonia identified on the frontal radiograph . No pleural effusion or pneumothorax evident .
    OUTPUT:
    
No definitive acute intrathoracic process . If continued concern , could repeat conventional radiograph with lateral view .