title: Endovaginal magnetic resonance imaging of stage 1A/1B cervical cancer with A T2- and diffusion-weighted magnetic resonance technique: effect of lesion size and previous cone biopsy on tumor detectability.
abstract: OBJECTIVE
  To evaluate the effects of previous cone biopsy and lesion size on detectability of stage 1a/1b cervical cancer using endovaginal T2- and diffusion-weighted magnetic resonance imaging.
  
  
  METHODS
  One hundred and thirteen patients with cervical tumor were imaged using an endovaginal coil with T2-weighted (T2-W) and diffusion-weighted single-shot echo-planar sequences; 85 managed surgically (58 with prior cone biopsy/LLETZ) were evaluated. T2-W images and ADC maps viewed simultaneously were scored positive or negative for tumor and compared with histology at surgery. MRI tumor volumes, maximum radiological and histological dimensions were recorded. ROC analysis determined the MRI volume with optimal sensitivity/specificity for identifying tumor in those without and with prior cone biopsy/LLETZ and the maximum histological dimension for correctly identifying tumor with MRI. Mean apparent diffusion coefficients (ADCs) from tumor and adjacent normal epithelium were compared.
  
  
  RESULTS
  Sensitivity and specificity for detecting tumor in those without (100%; 100% respectively) and with (80%; 78.9% respectively) prior cone biopsy/LLETZ were significantly different (p<0.001). Following cone biopsy/LLETZ, MRI tumor volume of 83 mm3 detected tumor with 80% sensitivity, 94.7% specificity; a 5.3mm maximal histological dimension was detected on MRI with 100% sensitivity, 100% specificity. Tumor ADCs were significantly lower (p<0.001) than paired normal epithelial tissue (median, 988×10(-6) mm2/s vs. 1564×10(-6) mm2/s) but neither tumor nor epithelial ADCs differed significantly between patients with or without prior cone biopsy/LLETZ (p=0.48 and 0.15, respectively).
  
  
  CONCLUSIONS
  Endovaginal MRI with T2- and diffusion-weighted sequences has significantly lower sensitivity and specificity for tumor detection following cone biopsy/LLETZ.
authors.affiliation: Cancer Research UK Clinical Magnetic Resonance Group, Institute of Cancer Research and Royal Marsden NHS Foundation Trust, Surrey SM2 5PT, UK.
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Charles-Edwards
authors.forename: Veronica
authors.initials: V
authors.lastname: Morgan
authors.forename: Ayoma D
authors.initials: AD
authors.lastname: Attygalle
authors.forename: Sharon L
authors.initials: SL
authors.lastname: Giles
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Ind
authors.forename: Michael
authors.initials: M
authors.lastname: Davis
authors.forename: John
authors.initials: J
authors.lastname: Shepherd
authors.forename: Norman
authors.initials: N
authors.lastname: McWhinney
authors.forename: Nandita M
authors.initials: NM
authors.lastname: deSouza
mesh_terms: D000328:Adult; D000368:Aged; D001706:Biopsy; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D005260:Female; D006801:Humans; D008875:Middle Aged; D009367:Neoplasm Staging; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D002583:Uterine Cervical Neoplasms / Q000175:diagnosis / Q000473:pathology*