title: Dural cyst at the foramen magnum.
abstract: A 69-year-old male presented with a rare dural cyst manifesting as numbness and pain in the limbs. Magnetic resonance imaging revealed a mass anterior to the medulla oblongata appearing as low intensity on T(1)-weighted and high intensity on T(2)-weighted imaging, with no enhancement. A cystic lesion ventral to the medulla oblongata was removed via the lateral suboccipital transcondylar approach. Histological examination showed the wall of the cyst consisted of fibrous connective tissue with a dense zone and a loose zone, similar to the structure found in the dura mater. The lesion was diagnosed as dural cyst. Dural cysts can be defined as cyst with the wall consisting of dura mater-like fibrous tissue, and attached to the dura mater. The origin of the present dural cyst was considered to be congenital.
authors.affiliation: Department of Neurosurgery, Keio University School of Medicine, Tokyo, Japan. shigeo.ohba@gmail.com
authors.forename: Shigeo
authors.initials: S
authors.lastname: Ohba
authors.forename: Kazunari
authors.initials: K
authors.lastname: Yoshida
authors.forename: Ichiro
authors.initials: I
authors.lastname: Sugiyama
authors.forename: Eiji
authors.initials: E
authors.lastname: Ikeda
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kawase
mesh_terms: D000368:Aged; D003388:Cranial Fossa, Posterior / Q000473:pathology* / Q000601:surgery; D003560:Cysts / Q000150:complications / Q000473:pathology* / Q000601:surgery*; D004388:Dura Mater / Q000473:pathology* / Q000601:surgery*; D005539:Foramen Magnum / Q000473:pathology* / Q000601:surgery; D006801:Humans; D008297:Male; D008526:Medulla Oblongata / Q000473:pathology / Q000601:surgery