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Updated: May 13, 2026
Isolation, Enrichment, and Maintenance of Medulloblastoma Stem Cells
Published on: September 1, 2010
Distinctive MRI features of pediatric medulloblastoma subtypes
Kristen W Yeom1, Bret C Mobley, Robert M Lober
1Department of Radiology, Lucile Packard Children's Hospital, Stanford University, 725 Welch Rd, Pediatric MRI & CT, Rm 0511, Palo Alto, CA 94304, USA. kyeom@stanford.edu
Objective:
We hypothesized that the apparent diffusion coefficient (ADC) and other MRI features can be used to predict medulloblastoma histologic subtypes, as defined by the World Health Organization (WHO) in WHO Classification of Tumours of the Central Nervous System.
Materials And Methods:
A retrospective review of pediatric patients with medulloblastoma between 1989 and 2011 identified 38 patients with both pretreatment MRI and original pathology slides. The mean and minimum tumor ADC values and conventional MRI features were compared among medulloblastoma histologic subtypes.
Results:
The cohort of 38 patients included the following histologic subtypes: 24 classic medulloblastomas, nine large cell (LC) or anaplastic medulloblastomas, four desmoplastic medulloblastomas, and one medulloblastoma with extensive nodularity. The median age at diagnosis was 8 years (range, 1-21 years) and the median follow-up time was 33 months (range, 0-150 months). The mean ADC (× 10(-3) mm(2)/s) was lower in classic medulloblastoma (0.733 ± 0.046 [SD]) than in LC or anaplastic medulloblastoma (0.935 ± 0.127) (Mann-Whitney test, p = 0.004). Similarly, the minimum ADC was lower in classic medulloblastoma (average ± SD, 0.464 ± 0.056) than in LC or anaplastic medulloblastoma (0.630 ± 0.053) (p = 0.004). The MRI finding of focal cysts correlated with the classic and desmoplastic subtypes (Fisher exact test, p = 0.026). Leptomeningeal enhancement positively correlated with the LC or anaplastic medulloblastoma subtype and inversely correlated with the classic medulloblastoma and desmoplastic medulloblastoma subtypes (p = 0.04). Ring enhancement correlated with tumor necrosis (p = 0.022) and with the LC or anaplastic medulloblastoma histologic subtype (p < 0.001).
Conclusion:
The LC or anaplastic medulloblastoma subtype was associated with increased ADC and with ring enhancement, the latter of which correlated with tumor necrosis. These features could be considered in the evaluation of high-risk medulloblastoma subtypes.
Insights
Apparent diffusion coefficient (ADC) and MRI features can predict medulloblastoma subtypes. Large cell or anaplastic medulloblastomas showed higher ADC and ring enhancement, indicating potential for risk stratification.
Area of Science:
- Neuroradiology
- Pediatric Oncology
- Medical Imaging
Background:
- Medulloblastoma is a common pediatric brain tumor.
- Accurate histologic subtyping is crucial for treatment planning and prognosis.
- Non-invasive imaging biomarkers are needed for improved diagnostic accuracy.
Purpose of the Study:
- To investigate if apparent diffusion coefficient (ADC) and other MRI features can predict medulloblastoma histologic subtypes.
- To correlate MRI findings with World Health Organization (WHO) defined subtypes.
Main Methods:
- Retrospective review of 38 pediatric medulloblastoma patients (1989-2011).
- Analysis of pretreatment MRI and pathology slides.
- Comparison of mean/minimum tumor ADC values and conventional MRI features across subtypes.
Main Results:
- Classic medulloblastomas had lower mean and minimum ADC compared to large cell (LC) or anaplastic subtypes.
- Focal cysts correlated with classic and desmoplastic subtypes.
- Leptomeningeal enhancement and ring enhancement were associated with LC/anaplastic subtypes and tumor necrosis.
Conclusions:
- Increased ADC and ring enhancement are associated with the LC or anaplastic medulloblastoma subtype.
- These MRI features may aid in evaluating high-risk medulloblastoma subtypes.
- Further research can refine the use of MRI in medulloblastoma classification.
