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Histological types of PPL and SPL in the present study. PPL, primary pulmonary lymphoma; SPL, secondary pulmonary lymphoma; MALT, mucosa-associated lymphoid tissue; MCL, mantle cell lymphoma; DLBCL, diffuse large B cell lymphoma; NSHL, nodular sclerosis Hodgkin's lymphoma; NK/T, natural killer/T cell.
