Distinguishing clinical and electrodiagnostic features of X-linked bulbospinal neuronopathy.

Journal Article (Journal Article)

X-linked bulbospinal neuronopathy (XLBSN) or Kennedys disease is a rare inherited neuromuscular disease characterized by adult-onset muscle weakness, usually in a limb-girdle distribution. It is frequently misdiagnosed despite a distinctive clinical presentation, usually due to the absence of a clear family history, and perhaps also due to failure of recognition. Accurate diagnosis is crucial for genetic counseling purposes and because alternative diagnoses usually carry a poorer prognosis. We evaluated 4 patients with XLBSN and one symptomatic female heterozygote patient. Based on our clinical observations in these patients and a systematic review of previously reported cases, the following clinical and electrophysiologic features when present in the setting of adult-onset muscle weakness, are strongly suggestive of the disorder: 1) facial weakness, 2) facial twitching or fasciculations, 3) tongue weakness and atrophy, 4) postural hand tremor, 5) hypo- or areflexia, and 6) absent or low-amplitude sensory nerve action potentials despite clinically normal sensation. We also hypothesize regarding the possibility of partial expression of the abnormal XLBSN gene in a symptomatic heterozygote female patient.

Full Text

Duke Authors

Cited Authors

  • Meriggioli, MN; Rowin, J; Sanders, DB

Published Date

  • December 1999

Published In

Volume / Issue

  • 22 / 12

Start / End Page

  • 1693 - 1697

PubMed ID

  • 10567082

International Standard Serial Number (ISSN)

  • 0148-639X

Digital Object Identifier (DOI)

  • 10.1002/(sici)1097-4598(199912)22:12<1693::aid-mus11>3.0.co;2-s


  • eng

Conference Location

  • United States