Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is redemonstration of a left - sided Port - A - Cath , ending in the low SVC . The lungs are clear . The heart size is normal . The mediastinal contours are normal . There are no pleural effusions . No pneumothorax is seen . Mild sclerosis is seen within the left humeral head , nonspecific in nature .
    OUTPUT:
    
1 . No acute cardiac or pulmonary findings . 2 . Nonspecific sclerosis within the left humeral head , possibly secondary to avascular necrosis given this patient 's history of sickle cell disease .