title: Sonography and MR imaging of bifid median nerve with anatomic and histologic correlation.
abstract: OBJECTIVE
  Imaging of a bifid median nerve has not been previously described in the radiology literature. We present three cases of bifid median nerve. The first is a patient with carpal tunnel syndrome seen on sonography and confirmed at surgery. The other two were found among 10 cadaveric specimens and were imaged with sonography and MR imaging. Confirmation of bifid median nerve in these two specimens was obtained using anatomic and histologic correlation.
  
  
  CONCLUSIONS
  Sonography and MR imaging can allow effective diagnosis and delineation of a bifid median nerve in the wrist. This diagnosis is important to make before carpal tunnel release or other wrist surgeries are performed to avoid nerve injury. Furthermore, the sonographic size criteria for diagnosing carpal tunnel syndrome in nonbifid median nerves may not be accurate in evaluating bifid median nerves.
authors.affiliation: Department of Radiology, University of Michigan Medical Center, 1500 E. Medical Center Dr., TC-2910G, Ann Arbor, MI 48109-0326, USA.
authors.forename: T
authors.initials: T
authors.lastname: Propeck
authors.forename: T J
authors.initials: TJ
authors.lastname: Quinn
authors.forename: J A
authors.initials: JA
authors.lastname: Jacobson
authors.forename: A F
authors.initials: AF
authors.lastname: Paulino
authors.forename: G
authors.initials: G
authors.lastname: Habra
authors.forename: V B
authors.initials: VB
authors.lastname: Darian
mesh_terms: D000293:Adolescent; D002102:Cadaver; D002349:Carpal Tunnel Syndrome / Q000175:diagnosis* / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008475:Median Nerve / Q000002:abnormalities*; D014463:Ultrasonography; D014953:Wrist