A 47-year-old man presented with diarrhoea, acquired hypo gammaglobuli
naemia and a cutaneous graft-versus-host-like reaction in association
with a spindle cell thymoma. Graft-versus-host reactions usually occur
following allogeneic transplantation or transfusion of immunocompeten
t lymphoid cells but have been described rarely in the context of a th
ymoma.