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Objectives <p>This study aimed to identify characteristic findings of odontogenic myxoma (OM) and assess the role of MRI in differentiating OM from ameloblastoma by analysing cyst-like areas.</p> Methods <p>MRI images from 12 and 15 patients with OM and ameloblastoma, respectively, were retrospectively evaluated to determine imaging features useful for differentiation. We analysed cyst-like areas in OM using apparent diffusion coefficient (ADC) values and gadolinium contrast patterns, comparing them with those in ameloblastoma. ADC values were statistically assessed via the Mann–Whitney U test.</p> Results <p>In OM, the mean ADC value of cyst-like areas was 1.84 × 10⁻<sup>3</sup> mm<sup>2</sup>/s. Contrast-enhanced T1-weighted images showed signal enhancement, with a gradual increase on dynamic contrast-enhanced MRI (DCE-MRI). Conversely, in ameloblastoma, the mean ADC value was 2.28 × 10⁻<sup>3</sup> mm<sup>2</sup>/s. Unlike OM, its cyst-like areas lacked enhancement, with only the solid areas exhibiting a rapid signal increase on DCE-MRI. ADC values were significantly higher in ameloblastoma (<i>P</i> &lt; 0.05).</p> Conclusions <p>The presence or absence of contrast enhancement in cyst-like areas aids in differentiating OM from ameloblastoma. Additionally, ADC values may be used to differentiate between these tumors in the absence of contrast agents.</p>

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Differentiating odontogenic myxoma from ameloblastoma by focusing on cyst-like areas on MR images

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Ami Kuribayashi,
  • Shin Nakamura,
  • Hiroshi Watanabe,
  • Sakurako Kawashima,
  • Shinya Kotaki,
  • Akiko Imaizumi,
  • Hiroshi Tomisato,
  • Yoshikazu Nomura,
  • Miharu Taguchi,
  • Arisa Oki,
  • Sakiko Kume,
  • Masahiko Miura

摘要

Objectives

This study aimed to identify characteristic findings of odontogenic myxoma (OM) and assess the role of MRI in differentiating OM from ameloblastoma by analysing cyst-like areas.

Methods

MRI images from 12 and 15 patients with OM and ameloblastoma, respectively, were retrospectively evaluated to determine imaging features useful for differentiation. We analysed cyst-like areas in OM using apparent diffusion coefficient (ADC) values and gadolinium contrast patterns, comparing them with those in ameloblastoma. ADC values were statistically assessed via the Mann–Whitney U test.

Results

In OM, the mean ADC value of cyst-like areas was 1.84 × 10⁻3 mm2/s. Contrast-enhanced T1-weighted images showed signal enhancement, with a gradual increase on dynamic contrast-enhanced MRI (DCE-MRI). Conversely, in ameloblastoma, the mean ADC value was 2.28 × 10⁻3 mm2/s. Unlike OM, its cyst-like areas lacked enhancement, with only the solid areas exhibiting a rapid signal increase on DCE-MRI. ADC values were significantly higher in ameloblastoma (P < 0.05).

Conclusions

The presence or absence of contrast enhancement in cyst-like areas aids in differentiating OM from ameloblastoma. Additionally, ADC values may be used to differentiate between these tumors in the absence of contrast agents.