title: Diagnosis of unilateral trapezius muscle palsy: 54 Cases.
abstract: We assessed medical and surgical causes of unilateral trapezius muscle (TM) palsy and/or wasting.
  
  
  
  Clinical and electrodiagnostic data were collected in 54 patients with TM impairment over 21 years.
  
  
  
  In total, 35 cases had a medical origin: neuralgic amyotrophy (NA, n = 22), idiopathic unilateral TM palsy (n = 5), regional neck radiotherapy for different conditions (n = 2), facioscapulohumeral dystrophy (FSH) (n = 4), abnormal loop of the jugular vein (n = 1), or basilar impression (n = 1). Other etiologies were neck surgery (n = 16), cervicofacial lift (n = 2), or trauma (n = 1).
  
  
  
  There were 5 main diagnostic findings in unilateral TM palsy: (1) dynamic examination of the scapula provides a new clinical sign; (2) NA is the most frequent medical cause; (3) in medical cases, partial preservation of the upper TM can offer good recovery; (4) FSH must be considered, especially in young patients; and (5) minor neck surgery can lead to severe TM palsy. Muscle Nerve 56: 215-223, 2017.
authors.affiliation: 146 Laboratoire d'électroneuromyographie, Av. Ledru Rollin, 75011, Paris, France.|Département de Neurophysiologie Clinique, Hôpital de la Pitié-Salpétrière, Paris, France.
authors.forename: Paul
authors.initials: P
authors.lastname: Seror
authors.affiliation: Unité clinique de Pathologie Neuromusculaire, Institut de Myologie. Hôpital Pitié-Salpêtrière, Paris, France.
authors.forename: Tanya
authors.initials: T
authors.lastname: Stojkovic
authors.affiliation: Service de Rééducation et de Réadaptation de l'Appareil Locomoteur et des Pathologies du Rachis, Hôpital Cochin, APHP, Université Paris Descartes, PRES Sorbonne Paris Cité, ECaMO team, INSERM UMR-S 1153 et Institut Fédératif de Recherche sur le Handicap, Paris, France.
authors.forename: Marie Martine
authors.initials: MM
authors.lastname: Lefevre-Colau
authors.affiliation: Département de Neurophysiologie Clinique, Hôpital de la Pitié-Salpétrière, Paris, France.
authors.forename: Timothée
authors.initials: T
authors.lastname: Lenglet
mesh_terms: D000200:Action Potentials / Q000502:physiology; D000328:Adult; D000368:Aged; D004558:Electric Stimulation; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009431:Neural Conduction / Q000502:physiology; D010243:Paralysis / Q000175:diagnosis* / Q000473:pathology*; D011930:Reaction Time / Q000502:physiology; D012189:Retrospective Studies; D012720:Severity of Illness Index; D018709:Statistics, Nonparametric; D064171:Superficial Back Muscles / Q000503:physiopathology*
keywords: cervicofacial lift; electrodiagnosis; facio-scapulo-humeral dystrophy; iatrogenic nerve lesion; neck surgery; nerve compression; neuralgic amyotrophy; spinal accessory nerve; trapezius muscle; winging scapula