A Symptomatic Spinal Extradural Arachnoid Cyst with Lumbar Disc Herniation

Figure 3

A section of the cyst wall ((a): hematoxylin and eosin, original magnification ×40 and (b): ×400) demonstrates thick collagenous fibers and some clusters of meningothelial cells with arachnoid dura within the cyst. Postoperative 3-dimensional CT (c) shows the right-side L4 hemilaminectomy and upper L5 laminotomy, with preservation of the facet joints. Dynamic plain radiography ((d), (e)) shows no instability or kyphotic deformity.

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