Renal involvement by Rosai–Dorfman disease: CT findings

Abstract

Rosai–Dorfman disease is a rare disease characterized histologically by proliferation of histiocytes and has clinical features suggestive of a lymphomalike disease. Lymph nodes and extranodal sites might be involved, but renal involvement is rare. We present computed tomographic findings in three cases of renal involvement by Rosai–Dorfman disease. Two cases showed renal hilar masses and one case showed subcapsular hypodense infiltration. Renal involvement by Rosai–Dorfman disease has a characteristic appearance and should be included in the differential diagnosis of renal hilar masses or subcapsular hypodense infiltration.