ALK and mature T-cell and NK-cell non-Hodgkin lymphoma: We compared imaging by computed tomography (CT) or positron emission tomography (PET) for defining disease status prior to allo-SCT.<h4>Methods</h4>Eligible were adult patients with PTCL-NOS, AITL, and ALK-negative ALCL undergoing allo-SCT between 2010 and 2022 and reported to EBMT.<h4>Results</h4>1958 patients underwent allo-SCT.