Spinal canal decompression for hypertrophic neuropathy of the cauda equina with chronic inflammatory demyelinating polyradiculoneuropathy: A case report

Figure 2 Pathological findings. A: Toluidine blue staining of a cross-section of the nerve root demonstrated numerous onion bulbs and significant loss of large myelinated axons (Magnification: 200 ×); B: Immunohistochemical staining for S100 protein showing positivity of the onion bulbs (Magnification: 200 ×); C: Immunohistochemical staining for epithelial membrane antigen showing negativity of the onion bulbs (Magnification: 200 ×); D: Immunohistochemical staining for leukocyte common antigen showing negativity of the onion bulbs (Magnification: 200 ×).