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Primary and post-chemoradiotherapy MRI detection of extramural venous invasion in rectal cancer: the role of diffusion-weighted imaging.
- Source :
- La Radiologia Medica; Jun2020, Vol. 125 Issue 6, p522-530, 9p
- Publication Year :
- 2020
-
Abstract
- Objective: To assess the added value of diffusion-weighted imaging (DWI) to high-resolution T2-weighted sequences (HRT2w) in MRI detection of extramural venous infiltration (EMVI), according to the previous experience of radiologists. Methods: A cross-sectional study of a retrospective database including 1.5 T MRI records from 100 patients with biopsy-proven rectal cancer (2011–2016; 75 male/25 female, average 63 y/o), which included primary staging (54) and post-chemoradiotherapy follow-up MRIs (46). The reference standard was histology of surgical specimens. All cases were individually blindly reviewed by ten radiologists: three specialists in abdominal radiology, three specialized in different areas and four residents. In each case, the presence of EMVI was assessed twice: first, using just HRT2w; second, with DWI added to HRT2w. The results were pooled by experience, analyzing sensitivity, specificity, accuracy (area under ROC curve), likelihood ratios, predictive values and overstaging/understaging. Results: Addition of DWI improved diagnostic performance by specialists radiologists, particularly post-chemoradiotherapy (accuracy 0.74–0.84; positive likelihood ratio 3.9–9.1; overstaging 16–8%), less so at primary staging (specificity 76–87.2%; overstaging 21–11%). Non-specialist radiologists also improved, but only at primary staging (accuracy 0.59–0.63). Residents showed small changes, except for notably increased sensitivity in both primary staging (35.7–43%) and post-chemoradiotherapy (41.7–58.3%) staging, at the expense of increased overstaging. Conclusions: The addition of DWI improved the diagnostic performance of EMVI by experienced radiologists, downgrading overstaging, especially in post-chemoradiotherapy follow-up. It resulted in fewer changes for inexperienced radiologists (enhanced primary staging) and residents (increased sensitivity). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00338362
- Volume :
- 125
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- La Radiologia Medica
- Publication Type :
- Academic Journal
- Accession number :
- 143396343
- Full Text :
- https://doi.org/10.1007/s11547-020-01137-7