Supplementary Material 1: Suppl. Figure 1 Additional microscopic feature of the renal follicular dendritic cell sarcoma. a The atrophic and fibrotic renal parenchyma covered the tumor. Some sclerotic glomeruli (arrowheads) were present in the fibrotic tissue (magnification factor of 50x). b The tumor cells expressed CD23 almost diffusely (magnification factor of 200x). c The CD68 decorated the histiocytes; however, it was weakly expressed by some tumor cells, too (magnification factor of 200x). d S100 highlighted only scattered dendritic cells, while the neoplastic cells were negative (magnification factor of 200x)