Fig. 2

Representative electron microscopy findings of renal biopsy in case 6. A. Neoplastic cells infiltration was seen in the renal interstitium (×10,000). B. Special cytoplasmic crystals characterized by fuzzy filament structure were found in infiltrating neoplastic cells as indicated by arrows (×40,000). C. Intense IgG1 was detected in the crystalline structures of neoplastic cells as indicated by the arrow (Immunoelectron microscopy, ×50,000). D. Intense kappa was detected in the crystalline structures of neoplastic cells as indicated by the arrow (Immunoelectron microscopy, × 50,000)