Patient selection
This retrospective analysis included consecutive pLTs performed between January 2014 and December 2021 at the Department of Pediatric Transplantation, Tianjin First Central Hospital, Tianjin, China. The inclusion criteria were as follows: (I) the patient’s age at the time of operation was <14 years and (II) 18F-FDG PET/CT and lymph node biopsy were performed simultaneously in patients with clinically suspected PTLD. This study was approved by the Tianjin First Central Hospital Medical Ethics Committee (approval no. 2022N140KY).