Introduction
Light chain (AL) amyloidosis is a disease characterized by the deposition of AL amyloid protein in each tissue/organ, typically followed by lymphoproliferative disorder accompanied with globulinemia. Although monoclonal gammopathy of undetermined significance and multiple myeloma are well-known causes of AL amyloidosis, AL amyloidosis due to Waldenström’s macroglobulinemia (WM) has rarely been reported. Here, we report a case of AL amyloidosis developing during the course of WM.