PMC3964166_01
(A and B) Classification of spinal arachnoid cysts. (A) Two anatomical types of spinal arachnoid cysts; (B) novel five-type classification system determined by magnetic resonance imaging (MRI).
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Spinal arachnoid cysts were subdivided into five types: 1) intramedullary cysts/syrinxes, 2) subdural extramedullary, 3) subdural/epidural, 4) intraspinal epidural, or 5) intraspinal/extraspinal (Figure 1).