Spectral Presaturation Inversion Recovery MR Imaging Sequence after Gadolinium Injection to Differentiate Fibrotic Scar Tissue and Neoplastic Strands in the Mesorectal Fat in Patients Undergoing Restaging of Rectal Carcinoma after Neoadjuvant Chemo- and Radiation Therapy

Emilio Quaia, Veronica Ulcigrai, Matteo Coss, Luca De Paoli, Maja Ukmar, Fabrizio Zanconati, Alessandro De Pellegrin, Nicolò De Manzini, Maria Assunta Cova

Research output: Contribution to journalArticlepeer-review

Abstract

Rationale and Objectives: To retrospectively assess the value of spectral presaturation by inversion-recovery (SPIR) magnetic resonance (MR) imaging sequence after gadolinium injection to differentiate fibrotic scar tissue and tumoral infiltration within the mesorectal fat in patients with rectal carcinoma undergoing MR restaging after neoadjuvant chemo- and radiation therapy (CRT). Materials and Methods: Forty-three consecutive patients (mean age, 65.8 years; range, 46-85 years; male:female, 29:14) with locally advanced rectal carcinoma underwent CRT followed by surgery. MR imaging was performed before and after completion of CRT by using T2-weighted turbo spin-echo and T1-weighted SPIR sequences before and after gadolinium injection, and MR images were assessed by two radiologists in consensus. Logistic regression was conducted to test the significance of the MR image findings with histology. Results: After CRT the disease was either limited to the rectal wall (n = 18 patients) or presented perirectal infiltration (n = 25) on histology. In 21 patients, mesorectal enhancing strands were observed. Reticular-shaped enhancing strands reaching the mesorectal fascia presented the highest correlation with tumor infiltration of the mesorectal fat (OR 130.33, 95% CI: 4.1-4220.29; logistic regression), whereas linear-shaped enhancing strands either reaching or not reaching the mesorectal fascia (OR 0.25 or 0.1, 95% CI: 0.024-2.6 or 0.01-1.07) revealed the lowest correlation. Conclusions: Reticular-shaped enhancing strands on SPIR MR imaging after gadolinium injection are associated with tumor infiltration of the mesorectal fat. © 2011 AUR.

Original languageEnglish
Pages (from-to)1365-75
Number of pages11
JournalAcademic Radiology
Volume18
Issue number11
DOIs
Publication statusPublished - Nov 2011

Keywords

  • Adipose Tissue
  • Aged
  • Aged, 80 and over
  • Chemoradiotherapy, Adjuvant
  • Cicatrix
  • Contrast Media
  • Diagnosis, Differential
  • Fascia
  • Female
  • Fibrosis
  • Gadolinium
  • Gadolinium DTPA
  • Heterocyclic Compounds
  • Humans
  • Logistic Models
  • Magnetic Resonance Imaging
  • Male
  • Meglumine
  • Middle Aged
  • Neoadjuvant Therapy
  • Neoplasm Invasiveness
  • Neoplasm Staging
  • Organometallic Compounds
  • Rectal Neoplasms
  • Retrospective Studies

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