20 Chapter 2 Main staging variables used for risk stratification Variable Answer options 9 EMVI - Definitely EMVI- - Probably EMVI- - Equivocal (possibly EMVI -, possibly EMVI +) - Probably EMVI+ - Definitely EMVI+ Continuous 10 Total number of visible mesorectal nodes Number 11 Total number of suspicious mesorectal nodes Number 12 Tumour-MRF distance …. mm Other staging variables Variable Answer options Categorical 13 Morphology (shape) Annular, semi-annular, polypoid 14 Morphology (composition) Solid, mixed, mucinous 15 Sphincter invasion Definitely no sphincter invasion Probably no sphincter invasion Equivocal (possibly no sphincter invasion, possibly sphincter invasion) Probably sphincter invasion Definitely sphincter invasion 16# In case of sphincter involvement, level of involvement Internal sphincter only, including intersphincteric plane, including external sphincter Level of confidence: very unconfident, unconfident, equivocal, confident, very confident 17 Relation to peritoneal reflection Completely above, completely below, partially above/ below Continuous 18 Tumour length …. mm 19 Tumour height …. mm 20 Extramural invasion depth (in cT3-4 tumours) …. mm * T3 substage was not evaluated for all patient cases, but only when readers assigned a T3 stage # Level of sphincter involvement was not evaluated for all patient cases, but only when readers indicated a suspicion for sphincter involvement Results Patient and study reader characteristics Forty-six patients (61%) were male, median age was 64 (range 40-82) years. The study readers had a median of 11 years of experience as a radiologist after completion of residency training (range 2-28 years). Further patient and study reader characteristics are provided in Table 2. Table 1 Continued
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