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Article: Forward shifting of posterior dural sac during flexion cervical magnetic resonance imaging in Hirayama disease: An initial study on normal subjects compared to patients with Hirayama disease

TitleForward shifting of posterior dural sac during flexion cervical magnetic resonance imaging in Hirayama disease: An initial study on normal subjects compared to patients with Hirayama disease
Authors
KeywordsFunctional cervical spine MR imaging
Hirayama disease
Loss of attachment of posterior dural sac
Issue Date2011
PublisherElsevier Ireland Ltd. The Journal's web site is located at http://www.elsevier.com/locate/ejrad
Citation
European Journal Of Radiology, 2011, v. 80 n. 3, p. 724-728 How to Cite?
AbstractObjective: Forward shifting of the posterior cervical dural sac is the most important sign in diagnosing Hirayama disease but can also be seen in normal subjects, causing potential diagnostic dilemma. We aim to explore the degree of forward displacement of posterior dural sac in normal subjects compared to that with Hirayama disease. Materials and methods: 50 healthy male teenagers and 3 patients with Hirayama disease were recruited into the control group and patient group, respectively. MR imaging of the cervical spine was performed in both neutral and flexion positions for all subjects, with the following parameters measured: maximal distance of forward shifting of posterior dural sac, dimension of dural sac and spinal cord. Results: Forward shifting of the posterior cervical dural sac was depicted in 46% of normal subjects upon flexion position but without associated cord compression due to intrinsic expansion of the spinal canal volume. This intrinsic compensatory mechanism was inadequate in diseased patients leading to cord compression with significant increment in ratio of anteroposterior diameter of forward displacement of posterior dural wall/anteroposterior diameter of spinal canal ("x/y"), and decrement in ratio of anteroposterior diameter of spinal cord/perpendicular transverse diameter of spinal cord ("a/b"). Conclusion: Depicting of forward shifting of posterior dural sac alone on flexion position cannot reliably diagnose Hirayama disease, which should be established only if there is forward shifting of posterior dural sac, plus increased ratio of x/y and decreased ratio of a/b on flexion position from associated mass effect on the spinal cord. © 2010 Elsevier Ireland Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/143749
ISSN
2014 Impact Factor: 2.369
2014 SCImago Journal Rankings: 1.019
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLai, Ven_HK
dc.contributor.authorWong, YCen_HK
dc.contributor.authorPoon, WLen_HK
dc.contributor.authorYuen, MKen_HK
dc.contributor.authorFu, YPen_HK
dc.contributor.authorWong, OWen_HK
dc.date.accessioned2011-12-21T08:48:33Z-
dc.date.available2011-12-21T08:48:33Z-
dc.date.issued2011en_HK
dc.identifier.citationEuropean Journal Of Radiology, 2011, v. 80 n. 3, p. 724-728en_HK
dc.identifier.issn0720-048Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/143749-
dc.description.abstractObjective: Forward shifting of the posterior cervical dural sac is the most important sign in diagnosing Hirayama disease but can also be seen in normal subjects, causing potential diagnostic dilemma. We aim to explore the degree of forward displacement of posterior dural sac in normal subjects compared to that with Hirayama disease. Materials and methods: 50 healthy male teenagers and 3 patients with Hirayama disease were recruited into the control group and patient group, respectively. MR imaging of the cervical spine was performed in both neutral and flexion positions for all subjects, with the following parameters measured: maximal distance of forward shifting of posterior dural sac, dimension of dural sac and spinal cord. Results: Forward shifting of the posterior cervical dural sac was depicted in 46% of normal subjects upon flexion position but without associated cord compression due to intrinsic expansion of the spinal canal volume. This intrinsic compensatory mechanism was inadequate in diseased patients leading to cord compression with significant increment in ratio of anteroposterior diameter of forward displacement of posterior dural wall/anteroposterior diameter of spinal canal ("x/y"), and decrement in ratio of anteroposterior diameter of spinal cord/perpendicular transverse diameter of spinal cord ("a/b"). Conclusion: Depicting of forward shifting of posterior dural sac alone on flexion position cannot reliably diagnose Hirayama disease, which should be established only if there is forward shifting of posterior dural sac, plus increased ratio of x/y and decreased ratio of a/b on flexion position from associated mass effect on the spinal cord. © 2010 Elsevier Ireland Ltd.en_HK
dc.languageengen_US
dc.publisherElsevier Ireland Ltd. The Journal's web site is located at http://www.elsevier.com/locate/ejraden_HK
dc.relation.ispartofEuropean Journal of Radiologyen_HK
dc.subjectFunctional cervical spine MR imagingen_HK
dc.subjectHirayama diseaseen_HK
dc.subjectLoss of attachment of posterior dural sacen_HK
dc.subject.meshCervical Vertebrae - pathology-
dc.subject.meshDura Mater - pathology-
dc.subject.meshMagnetic Resonance Imaging - methods-
dc.subject.meshReproducibility of Results-
dc.subject.meshSpinal Muscular Atrophies of Childhood - pathology-
dc.titleForward shifting of posterior dural sac during flexion cervical magnetic resonance imaging in Hirayama disease: An initial study on normal subjects compared to patients with Hirayama diseaseen_HK
dc.typeArticleen_HK
dc.identifier.emailLai, V:laiv@hku.hken_HK
dc.identifier.authorityLai, V=rp01516en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ejrad.2010.07.021en_HK
dc.identifier.pmid20727701en_HK
dc.identifier.scopuseid_2-s2.0-80755188096en_HK
dc.identifier.hkuros197940en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80755188096&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume80en_HK
dc.identifier.issue3en_HK
dc.identifier.spage724en_HK
dc.identifier.epage728en_HK
dc.identifier.isiWOS:000296763300085-
dc.publisher.placeIrelanden_HK
dc.identifier.scopusauthoridLai, V=15829844300en_HK
dc.identifier.scopusauthoridWong, YC=7403040273en_HK
dc.identifier.scopusauthoridPoon, WL=7103025388en_HK
dc.identifier.scopusauthoridYuen, MK=7102031958en_HK
dc.identifier.scopusauthoridFu, YP=25927886100en_HK
dc.identifier.scopusauthoridWong, OW=36338049200en_HK
dc.identifier.citeulike7765707-

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