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IntroductionAmidst an increase in long-term survivors after allogeneic hematopoietic stem cell transplantation allo-HSCT , there has also been an increase in bronchiolitis obliterans BO , a lung lesion of chronic graft-versus-host disease chronic GVHD .1 The only curative therapy is lung transplantation, unfortunately solid organ transplantation after allo-HSCT is associated with a high likelihood of the development of advanced immunodeficiency. 2 This increases concern for the development of post-transplantation lymphoproliferative disorder PTLD . There are very few reported cases of cadaveric lung transplantation CLT after allo-HSCT in Japan. Although there is potential to reduce or even terminate immunosuppression with living-donor lobar lung transplantation using the same donor as for allo-HSCT, it is difficult to achieve this with CLT. An increase in the number of cases of CLT after allo-HSCT for BO is expected; therefore, it is necessary to pay attention to the complications associated with PTLD.