title: Report of a familial case of proatlas segmentation abnormality with late clinical onset.
abstract: Although proatlas segmentation abnormalities as developmental remnants around the foramen magnum have been reported in postmortem studies, they are rarely documented in a clinical setting. This report details the clinical and radiological characteristics of a rare case of proatlas segmentation abnormalities with clinical onset during the seventh decade of life. This case was suspected to have a familial factor. We also review the literature regarding this condition.
authors.affiliation: Department of Neurosurgery, Iseikai Hospital, Osaka, Japan; Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan. Electronic address: masao.umegaki@icloud.com.
authors.forename: Masao
authors.initials: M
authors.lastname: Umegaki
authors.affiliation: Department of Neurosurgery, Suita Municipal Hospital, Suita, Japan.
authors.forename: Yasuyoshi
authors.initials: Y
authors.lastname: Miyao
authors.affiliation: Department of Neurosurgery, Iseikai Hospital, Osaka, Japan.
authors.forename: Manabu
authors.initials: M
authors.lastname: Sasaki
authors.affiliation: Osaka Neurological Institute, Toyonaka, Japan.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Yoshimura
authors.affiliation: Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Iwatsuki
authors.affiliation: Department of Neurosurgery, Osaka University Graduate School of Medicine, Suita, Japan.
authors.forename: Toshiki
authors.initials: T
authors.lastname: Yoshimine
mesh_terms: D000293:Adolescent; D000368:Aged; D005260:Female; D005539:Foramen Magnum / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D006801:Humans; D009777:Occipital Bone / Q000002:abnormalities / Q000000981:diagnostic imaging
keywords: Craniovertebral junction; Posterior approach; Proatlas segmentation abnormality