title: An unusual cause of swan neck deformity of the fingers.
abstract: OBJECTIVE
  To describe a patient who presented with nonfixed swan neck deformity of the fingers and generalized body aches.
  
  
  METHODS
  Case report.
  
  
  METHODS
  Tertiary care teaching hospital.
  
  
  METHODS
  A 38-year-old woman who presented with swan neck deformity of the fingers.
  
  
  METHODS
  Electromyographic finding and electromyographic and clinical response to intravenous immunoglobulin.
  
  
  RESULTS
  Needle electromyography revealed continuous motor unit activity in the 50- to 70-Hz frequency during the resting state for all the muscles sampled, which suggests the possibility of neuromyotonia. After ruling out possible secondary causes, we treated the patient with intravenous immunoglobulin, considering primary neuromyotonia. The body ache improved by 100% on the visual analogue scale, and the electromyographic discharges disappeared from the paraspinal and tibialis anterior muscles and changed in its morphology to doublets, triplets, and multiplets in the first dorsal interossei and flexor digitorum profundus.
  
  
  CONCLUSIONS
  Neuromyotonia should be considered in the differential diagnosis of swan neck deformity of the fingers, especially in cases that show no fixed deformity and are not associated with any other rheumatologic stigmata.
authors: Department of Neurology, Jawaharlal Institute of Postgraduate Medical Education and Research, Dhanvanthri Nagar, Pondicherry, India. srijitheshpr@rediffmail.com
authors: P Rajendran
authors: PR
authors: Srijithesh
mesh_terms: D000328:Adult; D004576:Electromyography; D005260:Female; D006227:Hand Deformities, Acquired / Q000175:diagnosis* / Q000209:etiology* / Q000503:physiopathology; D006801:Humans; D020386:Isaacs Syndrome / Q000150:complications* / Q000175:diagnosis* / Q000503:physiopathology