Thymoma‐Associated Multiorgan Autoimmunity (TAMA) Presenting as a Graft Versus Host Disease‐Like Erythroderma

ABSTRACT Thymoma‐associated multiorgan autoimmunity (TAMA) is a rare paraneoplastic disorder that presents similarly to graft versus host disease (GVHD). We report a unique case of TAMA presenting as a GVHD‐like erythroderma in an elderly male with a history of benign thymoma. Cutaneous histopathological findings demonstrated vacuolar interface dermatitis with numerous dyskeratotic keratinocytes, exocytosis of lymphocytes, and a mildly acanthotic epidermis, which can be seen in several different disease processes. Thus, careful consideration of clinical presentation, historical information, laboratory testing, and histopathologic findings led to the correct diagnosis and treatment.