Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tip of the right Port - A - Cath has not significantly changed in position , and terminates in the low SVC . Lung volumes are normal . There is no consolidation , pleural effusion or pneumothorax . There is an ill - defined sclerotic focus in the proximal right humerus , which corresponds to the previously biopsy - proven Langerhans cell histiocytosis lesion .
    OUTPUT:
    
1 . Unchanged Port - A - Cath tip , terminating in the low SVC . 2 . Incompletely characterized right proximal humerus lesion , corresponding to known Langerhans cell histiocytosis .