MRI features of pediatric intracranial germ cell tumor subtypes

Chih Chun Wu, Wan Yuo Guo, Feng Chi Chang, Chao Bao Luo, Han Jui Lee, Yi Wei Chen, Yi Yen Lee, Tai-Tong Wong

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Intracranial germ cell tumors differ in histology and location, and require different clinical management strategies. We characterized the imaging features that may aid pre-operative differentiation of intracranial germinomas and non-germinomatous germ cell tumors (NGGCTs). This retrospective study analyzed 85 patients with intracranial germ cell tumors and adequate preoperative or pretreatment MRIs between 2000 and 2013 at our institution. Pretreatment MRI characteristics, apparent diffusion coefficient (ADC) values, tumor histopathology, and patient outcomes were compared. NGGCTs occurred in the pineal region and cerebral hemispheres more often than germinomas; all bifocal lesions were germinomas. NGGCTs (36.6 ± 17.0 mm) were significantly larger than germinomas (25.7 ± 11.6 mm; P = 0.002). The presence of pure solid tumor (45.5 vs. 20.0%, P = 0.033) and an infiltrative margin (20.0 vs. 3.3%, P = 0.035) were significantly more common in germinomas than NGGCTs. The presence of intratumoral T1 hyperintense foci (66.7 vs. 10.9%, P < 0.001) and moderate/marked enhancement (86.7 vs. 50.9%, P < 0.001) were significantly more common in NGGCTs than in germinomas. Mean ADCmean values (×10−3 mm2/s) were significantly lower in germinomas (1.113 ± 0.415) than in NGGCTs (2.011 ± 0.694, P = 0.001). Combined a lack of T1 hyperintense foci and an ADCmean threshold value (1.143 × 10−3 mm2/s) had the highest specificity (91.3%) and positive predictive value (92.3%), while the combination of lack of a T1 hyperintensense foci, no/mild enhancement, and an ADCmean threshold value had 100% sensitivity and 100% negative-predictive value for discriminating germinomas from NGGCTs. Pre-operative conventional MRI characteristics and diffusion-weighted MRI help clinicians to assess patients with intracranial germ cell tumors. Tumor size, location, T1 hyperintense foci, intratumoral cystic components, tumor margin and enhancing patterns demonstrate contrast between germinomas and NGGCTs. Serum tumor markers and adjunctive combination with T1 hyperintensity and/or enhancing pattern with ADC offer potential in preoperative differentiating intracranial germinomas and NGGCTs.

Original languageEnglish
Pages (from-to)221-230
Number of pages10
JournalJournal of Neuro-Oncology
Volume134
Issue number1
DOIs
Publication statusPublished - Aug 1 2017

Keywords

  • Apparent diffusion coefficient
  • Central nervous system
  • Diffusion-weighted imaging
  • Germ cell tumor
  • Magnetic resonance imaging

ASJC Scopus subject areas

  • Oncology
  • Neurology
  • Clinical Neurology
  • Cancer Research

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  • Cite this

    Wu, C. C., Guo, W. Y., Chang, F. C., Luo, C. B., Lee, H. J., Chen, Y. W., Lee, Y. Y., & Wong, T-T. (2017). MRI features of pediatric intracranial germ cell tumor subtypes. Journal of Neuro-Oncology, 134(1), 221-230. https://doi.org/10.1007/s11060-017-2513-x