Diagnosis and Treatment of Intradural Arachnoid Cysts of the Thoracic Spine

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Abstract
The majority of spinal arachnoid cysts are found in the posterior subarachnoid space and arise from or within the septum posticum. The septum posticum is a thin membranous partition which divides the posterior spinal subarachnoid space longitudinally, from the cervical to the lower dorsal region. It was first described in 1843 by Magendie (3), who found it to be composed of thin, transparent lamellae irregularly separated by small spaces of various shapes and sizes. This membranous partition was exhaustively studied by Key and Retzius (Fig. 1) (1). In later anatomical textbooks it is also called septum arachnoidale or subarachnoidale, septum cervicale intermedium, septum leptomeningicum dorsale, and septum posticum of Schwalbe. Primary arachnoid cysts arising within the layers of the septum posticum are rarely encountered in clinical practice. We believe, however, that such cysts, unassociated with arachnoiditis, form a definite clinical entity and deserve inclusion in a differential diagnosis of compress...

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