Keywords: GVHD, graft-versus-host disease; IVIg, intravenous immunoglobulin; MGT, modified Goeckerman therapy; TAMA, thymoma-associated multiorgan autoimmunity; TLR, Toll-like receptor; erythroderma; graft-versus-host–like disease; hydroxychloroquine; paraneoplastic; thymoma.