Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Heart size is normal . The mediastinal contours are within normal limits . Crowding of bronchovascular structures is present without overt edema . Patchy left perihilar and bibasilar opacities may reflect atelectasis , but infection is not excluded in the correct clinical setting . No pneumothorax or pleural effusion is present . No displaced fractures are identified . Calcification within the left neck correlates to a calcified nodule in the thyroid gland on CT of the cervical spine .
    OUTPUT:
    
Low lung volumes . Patchy opacities in the left perihilar area and both lung bases are nonspecific , and may reflect areas of atelectasis , but infection in the left lung base can not be completely in the correct clinical setting .