Primary renal zygomycosis due to Rhizopus oryzae.

Primary renal zygomycosis is a rare fungal infection, and only 45 cases have been reported in the literature. The major etiologic agents of the disease were Mucor spp., Rhizomucor spp., Rhizopus spp. and Absidia spp. Here we report a case of primary renal zygomycosis due to Rhizopus oryzae infection. The patient had systemic lupus erythematosus and was treated with corticosteroids. He had frequent micturition, urodynia and passed amorphous and membranous-looking masses through the urethra several times prior to admission. Histopathological examination of the mass showed numerous broad and nonseptate hyphae. Rhizopus oryzae was isolated from the mass. We also reviewed the clinical features of primary renal zygomycosis in the literature.