Transforaminal endoscopic excision of bi-segmental non-communicating spinal extradural arachnoid cysts: A case report and literature review

Figure 2 Histopathology of the wall of the cyst. A: Histopathology of the wall of the cyst demonstrated dense fibrous tissue mesenchyme hyaline degeneration. Magnification: 100 ×; B: The cystic fluid included a blood clot, without any components of epithelium or stroma. Magnification: 200 ×.