title: Effect of gadolinium contrast-enhanced T1-weighted magnetic resonance imaging for detecting extramural venous invasion in rectal cancer.
abstract: To evaluate the performance of gadolinium contrast-enhanced T1-weighted magnetic resonance imaging (CET1WI) in addition to high-resolution T2-weighted imaging (HRT2WI) for preoperative detection of extramural venous invasion (EMVI) in rectal cancer.
  
  
  
  Fifty-nine patients with rectal cancer who underwent preoperative MRI were included in this study. The likelihood of EMVI was retrospectively scored by two readers on CET1WI, HRT2WI, and HRT2WI + CET1WI, using a subjective five-point scale ranging from 0 to 4. The pathological status of EMVI was used as a standard reference. Diagnostic parameters, including area under the receiver operating curve (AUC), sensitivity, and specificity, were calculated, and the diagnostic performances of HRT2WI and HRT2WI + CET1WI were compared. Interobserver variance was also evaluated.
  
  
  
  Eighteen (30.5%) patients showed pathological EMVI. During EMVI detection, reader A obtained an AUC of 0.768, sensitivity of 72.5%, and specificity of 73.2% from HRT2WI alone; after combination with CET1WI, these values improved to 0.864, 83.3%, and 75.6%, respectively. Differences in AUC between these techniques were not significant (p = 0.056). Reader B obtained an AUC of 0.833, sensitivity of 77.8%, and specificity of 73.2% from HRT2WI alone; after combination with CET1W1, these figures were adjusted to 0.720, 50%, and 78%; differences in AUC between techniques were significant (p = 0.027). Interobserver agreement during EMVI scoring was good for HRT2WI (κ = 0.603) and moderate for HRT2WI + CET1WI (κ = 0.413).
  
  
  
  Although interobserver agreement decreased, combination of CET1WI with HRT2WI could improve EMVI detection.
authors.affiliation: Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Yong'an Road 95, Beijing, 100050, People's Republic of China.|Department of Radiology, Shandong Cancer Hospital Affiliated to Shandong University, Jinan, People's Republic of China.
authors.forename: Liheng
authors.initials: L
authors.lastname: Liu
authors.affiliation: Department of Pathology, Shandong Cancer Hospital Affiliated to Shandong University, Jinan, People's Republic of China.
authors.forename: Linke
authors.initials: L
authors.lastname: Yang
authors.affiliation: Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Yong'an Road 95, Beijing, 100050, People's Republic of China. drerhujin@163.com.
authors.forename: Erhu
authors.initials: E
authors.lastname: Jin
authors.affiliation: Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Yong'an Road 95, Beijing, 100050, People's Republic of China.
authors.forename: Zhenchang
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Yong'an Road 95, Beijing, 100050, People's Republic of China.
authors.forename: Zhenghan
authors.initials: Z
authors.lastname: Yang
mesh_terms: D003287:Contrast Media; D005682:Gadolinium; D006801:Humans; D008279:Magnetic Resonance Imaging; D009361:Neoplasm Invasiveness; D012004:Rectal Neoplasms
chemical_list: D003287:Contrast Media; D005682:Gadolinium
keywords: Contrast agent; Diagnosis; Magnetic resonance imaging; Neoplasm invasiveness; Rectal cancer