title: Evaluation of intrasyrinx fluid motion by spatial modulation of magnetization-magnetic resonance imaging in syringomyelia with long-term follow-up: a predictor of postoperative prognosis?
abstract: OBJECTIVE
  To evaluate the use of measuring intrasyrinx fluid motion in syringomyelia by spatial modulation of magnetization (SPAMM)-magnetic resonance imaging (MRI) for predicting postoperative results.
  
  
  METHODS
  Fourteen patients with syringomyelia, who underwent surgery between 1995 and 2004 and took both preoperative SPAMM-MRI and postoperative MRI, were reviewed retrospectively. The SPAMM-MRI was obtained on a 1.5-T system using the electrocardiogram-triggered multiphase image technique with repetition time/time to echo/diffusion time/flip angle = 42 milliseconds/7.2 milliseconds/0 to 600 milliseconds/20 degrees. Three radiologists analyzed the tagging band shifting of the intrasyrinx fluid motions on the preoperative SPAMM-MRI. If the tagging band shifting during the systolic phase was more than half of the band space, it was regarded as good fluid motion. The correlation between the preoperative intrasyrinx fluid motion and the postoperative shrinkage of the syrinx was statistically analyzed.
  
  
  RESULTS
  The underlying causes of the syringomyelia were Arnold-Chiari malformation (7 patients), trauma (4 patients), and infectious disease (3 patients). Eight of 9 patients who had good fluid motion in the syrinx showed postoperative shrinkage of the syrinx. However, the 5 patients who had poor fluid motion showed no shrinkage of the syrinx. The fluid motion of the syrinx was highly correlated with the postoperative shrinkage of the syrinx (P < 0.01).
  
  
  CONCLUSIONS
  Evaluation of the intrasyrinx fluid motion in syringomyelia using the SPAMM-MRI can be a useful predictor of postoperative results and may indicate how well the pulse wave is transmitted from the heart to the syrinx.
authors.affiliation: Department of Diagnostic Radiology and Research Institute of Radiological Science, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Yongdong Severance Hospital, Kangnam-Gu, Seoul, South Korea.
authors.forename: Chul Hwan
authors.initials: CH
authors.lastname: Park
authors.forename: Tae-Sub
authors.initials: TS
authors.lastname: Chung
authors.forename: Dong Joon
authors.initials: DJ
authors.lastname: Kim
authors.forename: Sang Hyun
authors.initials: SH
authors.lastname: Suh
authors.forename: Woo-Suk
authors.initials: WS
authors.lastname: Chung
authors.forename: Yong-Eun
authors.initials: YE
authors.lastname: Cho
mesh_terms: D000328:Adult; D004562:Electrocardiography / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008280:Magnetics; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D011237:Predictive Value of Tests; D011379:Prognosis; D012189:Retrospective Studies; D012212:Rheology; D013116:Spinal Cord / Q000473:pathology; D013595:Syringomyelia / Q000134:cerebrospinal fluid / Q000175:diagnosis* / Q000601:surgery; D013995:Time