Membranous Nephropathy and Kimura\u27s Disease Manifesting a Hip Mass. A Case Report with Literature Review

We report a case of Kimura\u27s disease with membranous nephropathy. A 15-year-old Japanese boy was referred to our hospital with proteinuria and a subcutaneous mass in the hip. Renal biopsy demonstrated secondary membranous nephropathy (MN) with mild mesangial proliferation and some electron-dense deposits in the mesangium. Laboratory tests revealed eosinophilia and a high level of serum IgE, which are common findings in Kimura\u27s disease. A biopsy of the mass in the hip was performed and Kimura\u27s disease was diagnosed. Treatment with oral prednisolone resulted in a decrease of proteinuria and regression of the subcutaneous mass. Kimura\u27s disease should be included in the differential diagnosis of secondary MN