Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . There is moderate parenchymal irregularity of the left lung base . No pleural effusion or pneumothorax is seen . There is cervical stabilization hardware , which appears unchanged comparison to the prior chest radiograph .
    OUTPUT:
    
1 . No evidence of malignancy . 2 . Parenchymal irregularity at left lung base , which may represent resolving infection or atelectasis . Recommend follow - up chest x-ray in ___ weeks for resolution .