Figure 15. Adenoidal posttransplantation lympho-proliferative disorder in a 12-year-old boy 8 years after bone marrow transplantation for acute lymphoblastic leukemia. CT image shows enlargement of the right-sided adenoidal tissue (arrows), which at biopsy was proved to be due to posttransplantation lymphoprolif-erative disorder. Opacification of the left maxillary sinus also is evident.