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Medulloblastoma

Case contributed by Frank Gaillard
Diagnosis almost certain

Patient Data

Age: 6 years
  • Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.
ct

Very large, slightly hyperdense mass located centrally within the posterior fossa.

As a result of the mass effect on the fourth ventricle, significant obstructive hydrocephalus has developed, with transependymal edema noted particularly around the frontal and occipital horns. 

mri

Very large mass located centrally within the posterior fossa. It is high T2 signal and low T1 signal with only patchy contrast enhancement.

No normal vermis can be identified and the mass is likely to arise from it, completely effacing the fourth ventricle and abutting the dorsal aspect of the brainstem without convincing evidence of extension into the pons. 

As a result of the mass effect on the fourth ventricle, significant obstructive hydrocephalus has developed, with transependymal edema noted particularly around the frontal and occipital horns. 

Case Discussion

Findings are consistent with a medulloblastoma (confirmed on histology).

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