title: Partial aplasia of the posterior arch of the atlas with an isolated posterior arch remnant: findings in three cases.
abstract: We report the imaging findings in three symptomatic cases of partial aplasia of the posterior arch of the atlas with an isolated posterior remnant of the arch. These cases are instructive in illustrating the mechanism of cord impingement produced by the posterior arch remnant during extension of the cervical spine. Additionally, focal increased T2 signal was observed within the cord at the level of the anomaly in two of the patients.
authors.affiliation: Department of Neuroradiology, Neurosciences, Centre, All India Institute of Medical Sciences, New Delhi.
authors.forename: A
authors.initials: A
authors.lastname: Sharma
authors.forename: S B
authors.initials: SB
authors.lastname: Gaikwad
authors.forename: P S
authors.initials: PS
authors.lastname: Deol
authors.forename: N K
authors.initials: NK
authors.lastname: Mishra
authors.forename: S S
authors.initials: SS
authors.lastname: Kale
mesh_terms: D000328:Adult; D001270:Cervical Atlas / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D011859:Radiography; D013117:Spinal Cord Compression / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology* / Q000628:therapy