Tài liệu Báo cáo y học: "Foramen Magnum Arachnoid Cyst Induces Compression of the Spinal Cord and Syringomyel

The commonest type of arachnoid cyst that causes compression of the spinal cord and development of syringomyelia is the Chiari malformation type I [1]. Other types of arachnoid cysts can occur as an occupied lesion in the posterior fossa and in Dan-dyWalker syndrome [2-10]. Occasionally, a posterior fossa arachnoid cyst can induce compression of the spinal cord and development of syringomyelia [11,12]Common features of these lesions are secondary cerebellar tonsillar herniation with syringomyelia due to mass effect, and the lesions cross most areas of the foramen magnum. It is very rare that a foramen magnum arachnoid cyst directly compresses the spinal cord and develops syringomyelia. Here we reported a rare case of foramen magnum arachnoid cyst with occupying only small area of the posterior fossa. We performed surgery on this patient. Meanwhile, we undertook a literature review on this topic as well, in order to provide better understanding and relate our experience in the diagnosis and treatment of foramen magnum arachnoid cyst.