• Joshua Abrams, Gordon Li, Stefan A Mindea, Claudia M Haynes, and Ivan Cheng.
• Department of Orthopedics, Stanford University Medical Center, Stanford, CA, USA. joshuahabrams@yahoo.com
• Eur Spine J. 2012 Jun 1;21 Suppl 4:S436-40.

ObjectiveTo present a rare case of multiple compressive thoracic intradural cysts with pathologic arachnoid ossification, review the literature and present the surgical options. Few reports have identified the existence of arachnoid calcifications and intrathecal cysts causing progressive myelopathy. The literature regarding each of these pathologies is limited to case reports. Their clinical significance is not well studied, although known to cause neurologic sequelae.MethodsAn 81-year-old female clinically presents with rapidly progressive myelopathy. Pre-operative magnetic resonance imaging identified multiple compressive thoracic intrathecal cysts. Surgical exploration and decompression of these cysts identified calcified plaques within the arachnoid. Histopathologic examination revealed fibrocalcific tissue undergoing ossification with bone marrow elements.ResultsDue to progressive myelopathy, the thoracic cysts were decompressed and calcified plaques were excised, once identified intra-operatively.ConclusionsOn last examination, the patient's neurologic status had not improved, but had stabilized. The rate of neurologic improvement from excision and decompression is variable, but it may still be warranted in the face of progressive neurologic deficits.

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