title: [Comparison of 3T dacryo-MRI by instillation with dacryo-CT scan for evaluation of epiphora].
abstract: OBJECTIVE
  Epiphora is frequently related to stenosis of the lacrimal drainage pathways. In the evaluation of stenosis, dacryo-CT scan remains the gold standard, despite the need for radiation and catheterization of the lacrimal passages. Evaluation by high field 3T MRI compared to the gold standard in the morphological study of the lacrimal passages and quantification of the stenosis is attractive considering the lack of radiation and non-invasive nature of the technique.
  
  
  METHODS
  Twenty-four patients were included, including 9 with bilateral epiphora, representing 33 pathological drainage systems out of 48. Twenty-three drainage systems underwent subsequent surgery (18 patients, 5 patients bilaterally).
  
  
  RESULTS
  The average diameter on CT scan images of the superior canaliculus was 0.70 mm (± 0.46), of the inferior canaliculus 0.69 (±0.42), the common canaliculus 0.68 (± 0.58), the lacrimal sac 4.32 (± 2.10), and the nasolacrimal duct 1.15 mm (±1.42). 3T dacryo-MRI overestimated the diameters by 0.35 to 1mm (up to 20 % of the lacrimal sac size), and the concordance between dacryo-CT scan and 3T dacryo-MRI was of average value (kappa 0.5, P<0.05) concerning the diagnosis of stenosis. Furthermore, dacryo-CT scan demonstrated higher sensitivity (72.7 %) than 3T dacryo-MRI (42.4 %).
  
  
  CONCLUSIONS
  The two techniques are not equivalent in the diagnosis of stenosis. An optimization of protocols and an evaluation on a larger cohort remain necessary before dacryo-CT scan can be replaced by dacryo-MRI in routine practice.
authors: Service de radiologie, centre Léon-Bérard, FNCLCC, 28, promenade Léa-et-Napoléon-Bullukian, 69373 Lyon, France. Electronic address: tatiana_taupin@hotmail.com.
authors: T
authors: T
authors: Taupin
authors: A
authors: A
authors: Ltaief Boudrigua
authors: Service de radiologie ostéo-articulaire et neurologique, pavillon B, hôpital Édouard-Herriot, hospices civils de Lyon, 5, place d'Arsonval, 69437 Lyon, France.
authors: L
authors: L
authors: Taief Boudrigua Aicha
authors: Centre ophtalmologique Kleber, 50, cours Franklin-Roosevelt, 69006 Lyon, France.
authors: E
authors: E
authors: Baggio
authors: Service d'ophtalmologie, centre hospitalier Lyon-Sud, 130, rue Jules-Guesde, 69495 Pierre-Bénite cedex, France.
authors: M
authors: M
authors: Gensburger
authors: Service de radiologie ostéo-articulaire et neurologique, pavillon B, hôpital Édouard-Herriot, hospices civils de Lyon, 5, place d'Arsonval, 69437 Lyon, France.
authors: J B
authors: JB
authors: Pialat
mesh_terms: D006801:Humans; D007765:Lacrimal Apparatus / Q000000981:diagnostic imaging / Q000473:pathology; D007766:Lacrimal Apparatus Diseases / Q000175:diagnosis*; D007767:Lacrimal Duct Obstruction / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging; D009301:Nasolacrimal Duct / Q000000981:diagnostic imaging* / Q000473:pathology*; D014057:Tomography, X-Ray Computed
keywords: Dacryo-CT scan; Dacryo-MRI; DacryoIRM; Dacryoscanner; Epiphora; Lacrimal duct obstruction; Obstruction canal lacrymal; Stenosis; Sténose; Épiphora