Gadofosveset-enhanced MRI for the assessment of rectal cancer lymph nodes: predictive criteria.

D.M. Lambregts, L. A. Heijnen, M. Maas, I. J. Rutten, M. H. Martens, W.H. Backes, R.G. Riedl, F.C. Bakers, V.C. Cappendijk, G.L. Beets, R.G.H. Beets-Tan

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

PURPOSE: To confirm the use of the nodal signal intensity (SI) and the 'chemical shift' artefact as diagnostic criteria for detecting nodal metastases from rectal cancer on gadofosveset contrast-enhanced MRI. METHODS: Thirty-three patients underwent a non-enhanced and gadofosveset-enhanced 3D-T1W GRE-MRI at 1.5T. For each lymph node, the SI of the middle part of the node (mSI) and white rim of the chemical shift artefact encircling the node (wSI) were measured on the non-enhanced and gadofosveset-enhanced images. Second, the aspect of the chemical shift artefact encircling the nodes was scored using a 4-point scale. Results were compared with histology on a node-by-node basis. RESULTS: 289 nodes (55 N+) were analysed. On gadofosveset-MRI, mSI and wSI were significantly higher for the benign than for the metastatic lymph nodes (p < 0.001). Areas under the ROC curve (AUC) for identification of metastases were 0.74 (mSI) and 0.73 (wSI). The chemical shift criterion rendered an AUC of 0.85. The combination of mSI and the chemical shift criterion resulted in an AUC of 0.88 and the rendered an AUC of 0.86-0.92 when subjectively (visually) assessed by two independent readers. CONCLUSIONS: Benign lymph nodes show significant contrast enhancement after gadofosveset injection, while metastatic nodes do not. The uptake of gadofosveset in the nodes also affects the chemical shift artefact encircling the nodes. Combined assessment of these two features on gadofosveset-enhanced MRI provides a high diagnostic performance for diagnosing metastatic lymph nodes in patients with rectal cancer.
Original languageEnglish
Pages (from-to)720-727
Number of pages8
JournalAbdominal Imaging
Volume38
Issue number4
DOIs
Publication statusPublished - Aug 2013

Keywords

  • Rectal neoplasms
  • Magnetic resonance imaging
  • Contrast agents
  • Lymph nodes
  • Diagnostic imaging
  • TOTAL MESORECTAL EXCISION
  • NEOADJUVANT CHEMORADIATION
  • PREOPERATIVE RADIOTHERAPY
  • METAANALYSIS
  • METASTASES
  • PATTERNS
  • THERAPY
  • USPIO

Cite this

Lambregts, D. M., Heijnen, L. A., Maas, M., Rutten, I. J., Martens, M. H., Backes, W. H., Riedl, R. G., Bakers, F. C., Cappendijk, V. C., Beets, G. L., & Beets-Tan, R. G. H. (2013). Gadofosveset-enhanced MRI for the assessment of rectal cancer lymph nodes: predictive criteria. Abdominal Imaging, 38(4), 720-727. https://doi.org/10.1007/s00261-012-9957-4