Inclusion Criteria:  Patients who have received a bi-lung transplant performed by the Marie Lannelongue lung transplant team between January 1, 2007 and April 30, 2021 All indications for transplantation will be considered, including retransplantation. French-speaking patient  Exclusion Criteria:  Patient is a minor (<18 years old) at the time of transplantation Patient's refusal to participate in the study Patient under guardianship or curatorship Patient deprived of liberty Patient under court protection Patient objecting to the use of his/her data for this research