A young man developed chronic graft-versus-host disease (GvHD) after allogeneic bone marrow transplantation. The close resemblance of his skin changes to those of patients with progressive systemic sclerosis (PSS) prompted an examination for clinical and pathologic involvement of other organ systems. Many of the dermatologic, cardiac, renal and pulmonary findings in the transplant patient were similar to those seen in a comparison group of 38 patients with PSS.