MR elastography of hepatocellular carcinoma: Correlation of tumor stiffness with histopathology features—Preliminary findings

Scott M. Thompson, Jin Wang, Vishal S. Chandan, Kevin J. Glaser, Lewis Rowland Roberts, Richard Lorne Ehman, Sudhakar K Venkatesh

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

Purpose To determine if tumor stiffness by MR Elastography (MRE) is associated with hepatocellular carcinoma (HCC) pathologic features. Material and methods A retrospective review was undertaken of all patients with pathologically confirmed HCC who underwent MRE prior to loco-regional therapy, surgical resection or transplant between 1/1/2007 to 12/31/2015. An independent observer measured tumor stiffness (kilopascals, kPa) by drawing regions of interest (ROI) covering the HCC and in the case of HCCs with non-enhancing/necrotic components, only the solid portion was included in the ROI. HCC tumor grade (WHO criteria), vascular invasion and tumor encapsulation were assessed from retrievable pathology specimens by an expert hepatobiliary pathologist. Tumor stiffness was compared by tumor grade, size, presence of capsule and vascular invasion using Student's t-test (or Exact Mann-Whitney test). Results 21 patients were identified who had pathologically confirmed HCCs and tumor MRE data. 17 patients (81.0%) had underlying chronic liver disease. The mean ± SD tumor size (cm) was 5.3 ± 3.9 cm. The mean ± SD tumor stiffness was 5.9 ± 1.4 kPa. Tumors were graded as well differentiated (N = 2), moderately differentiated (N = 11) and poorly differentiated (N = 8). There was a trend toward increased tumor stiffness in well/moderately differentiated HCCs (6.5 ± 1.2 kPa; N = 13) compared to poorly differentiated HCCs (4.9 ± 1.2 kPa; N = 8) (p < 0.01). There was no significant correlation between tumor stiffness and liver stiffness or tumor size. There was no significant difference in tumor stiffness by presence or etiology of chronic liver disease, vascular invasion or tumor encapsulation. Conclusion Preliminary data suggest that tumor stiffness by MRE may be able to differentiate HCC tumor grade.

Original languageEnglish (US)
Pages (from-to)41-45
Number of pages5
JournalMagnetic Resonance Imaging
Volume37
DOIs
StatePublished - Apr 1 2017

Keywords

  • HCC
  • Hepatocellular carcinoma
  • MR elastography
  • MRE
  • Tumor grade

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

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