• Ryota Miyazawa, Satoru Miyawaki, Keisuke Yamada, Shiori Amemiya, Masako Ikemura, Munetoshi Hinata, Hiroki Uchikawa, Taketo Shiode, Taichi Kin, Keisuke Takai, Hirofumi Nakatomi, and Nobuhito Saito.
• Department of Neurosurgery, Faculty of Medicine, The University of Tokyo, Tokyo, Japan.
• World Neurosurg. 2020 Dec 1; 144: 148-153.

BackgroundGanglion cysts mostly occur in the knuckles and wrists, but they rarely present in the odontoid process and can cause neurological symptoms by compressing the spinal cord. They are mostly localized in the epidural space, but may very rarely appear in the intradural space. There are no reports of cases of intradural ganglion cyst involving syringobulbia.Case DescriptionWe report the presentation and management of 2 cases of an intradural ganglion cyst of the odontoid process. Several treatment options for ganglion cysts of the odontoid process have been reported, such as rest and use of a neck collar, posterior decompression and fusion, and transoral anterior decompression. Because our 2 cases progressed rapidly and had severe neurological symptoms, surgical treatment was performed for rapid decompression and definitive pathological diagnosis. The mass was resected as much as possible using the lateral occipital fossa approach, and the operation was completed without dissection of the brain stem or manipulation of the syringobulbia. Postoperatively, neurological symptoms promptly improved, and the syringobulbia reduced.ConclusionsFor intradural ganglion cysts with syringobulbia, we suggest relief of the compression by resection of the mass and treatment of the syringobulbia in 2 stages, if necessary, to avoid the risk of damage to the brainstem.Copyright © 2020 Elsevier Inc. All rights reserved.

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