Systemic sclerosis presenting TAFRO syndrome-like manifestations including renal glomerular microangiopathy: a case report and literature review

TAFRO syndrome is a systemic inflammatory disorder of unknown etiology, and its diagnosis requires the exclusion of autoimmune diseases. A 42-year-old Japanese woman presented with TAFRO syndrome-like manifestations, but had undiagnosed limited-cutaneous systemic sclerosis preventing a definitive diagnosis of TAFRO syndrome. However, her clinical course and pathological findings, including renal glomerular microangiopathy, were consistent with TAFRO syndrome. We performed a systematic review of the literature to evaluate how autoimmunity affects the clinical characteristics of TAFRO syndrome/idiopathic multicentric Castleman disease (iMCD)-TAFRO. We reviewed 95 reported cases of TAFRO syndrome/iMCD-TAFRO and found that at least 41 (43.6%) had various autoantibodies. In particular, the positive rates of anti-nuclear antibody, anti-SS-A antibody, anti-SS-B antibody, PA-IgG, and direct Coombs test were high. Furthermore, we identified 14 cases of autoimmune diseases with TAFRO syndrome-like manifestations. We compared the clinical characteristics of these 14 with those of the autoantibody-positive and -negative cases among the 95 cases of TAFRO syndrome/iMCD-TAFRO. Apart from sex ratio, we found no significant difference in clinical presentation, treatment, or outcome among the groups. In conclusion, TAFRO syndrome/iMCD-TAFRO often accompanies autoantibodies and shares many clinical characteristics with other autoimmune diseases. Clinicians should be aware that some autoimmune diseases mimic TAFRO syndrome/iMCD-TAFRO.