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Updated: Jun 26, 2026
Isolation, Enrichment, and Maintenance of Medulloblastoma Stem Cells
Published on: September 1, 2010
Minimum apparent diffusion coefficient is significantly correlated with cellularity in medulloblastomas
Yoji Yamashita1, Toshihiro Kumabe, Shuichi Higano
1Department of Neurosurgery, Tohoku University Graduate School of Medicine, Aoba-ku, Sendai, Japan.
Objective:
On diffusion-weighted magnetic resonance (MR) images, posterior fossa tumors may exhibit the various signal intensity and apparent diffusion coefficient (ADC) reflecting their histology and cellularity. The purpose of this study was to evaluate the relationship between ADC and tumor cellularity in medulloblastoma and other posterior fossa tumors.
Methods:
Pre-operative diffusion-weighted MR images were retrospectively reviewed in 26 patients with posterior fossa neoplasms: 11 medulloblastomas, one atypical teratoid/rhabdoid tumor (AT/RT), four glioblastomas, four ependymomas, three pilocytic astrocytomas and three hemangioblastomas. The minimum ADC (minADC) value of each tumor was determined on ADC maps derived from isotropic diffusion-weighted MR images. The minADC values were compared by a two-tailed t-test. Tumor cellularity measured in surgical specimens was compared with the minADC value by simple linear regression analysis.
Results:
The mean minADC value of the medulloblastoma was significantly lower than those of ependymoma, pilocytic astrocytoma and hemangioblastoma without overlap in the range of minADC values. Therefore, medulloblastomas could be clearly differentiated by absolute minADC values. AT/RT and glioblastoma had similar minADC values to medulloblastoma. Tumor cellularity was negatively correlated with the minADC value in medulloblastomas and other posterior fossa tumors.
Discussion:
The low minADC value of medulloblastomas reflects the high tumor cellularity. Analysis of ADC values has high predictive value for the differentiation of medulloblastoma from other posterior fossa tumors.
Insights
Low apparent diffusion coefficient (ADC) values on MRI scans can help differentiate medulloblastomas from other posterior fossa tumors due to their high cellularity. This finding aids in diagnosing these brain tumors.
Area of Science:
- Neuroimaging
- Oncology
- Radiology
Background:
- Diffusion-weighted magnetic resonance (MR) imaging reveals varying signal intensities and apparent diffusion coefficient (ADC) values in posterior fossa tumors, correlating with histology and cellularity.
- Understanding these variations is crucial for accurate tumor characterization.
Purpose of the Study:
- To investigate the relationship between ADC values and tumor cellularity in medulloblastoma and other posterior fossa neoplasms.
- To evaluate the diagnostic utility of ADC in differentiating medulloblastoma from other posterior fossa tumors.
Main Methods:
- Retrospective analysis of pre-operative diffusion-weighted MR images from 26 patients with posterior fossa tumors (including medulloblastomas, AT/RT, glioblastomas, ependymomas, pilocytic astrocytomas, and hemangioblastomas).
- Determination of minimum ADC (minADC) values from isotropic diffusion-weighted MR images.
- Comparison of minADC values using t-tests and correlation with tumor cellularity via linear regression.
Main Results:
- Medulloblastomas exhibited significantly lower mean minADC values compared to ependymomas, pilocytic astrocytomas, and hemangioblastomas, allowing for clear differentiation.
- Atypical teratoid/rhabdoid tumors (AT/RT) and glioblastomas showed minADC values similar to medulloblastomas.
- Tumor cellularity demonstrated a negative correlation with minADC values across all analyzed posterior fossa tumors.
Conclusions:
- The low minADC values in medulloblastomas are indicative of their high cellularity.
- ADC value analysis demonstrates significant predictive value for distinguishing medulloblastomas from other posterior fossa tumors.
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