Medulloblastoma

Case contributed by A.Prof Frank Gaillard

Patient Data

Age: 6 years
Modality: CT

Very large mass located centrally within the posterior fossa. It is slightly hyperdense on CT.

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

Modality: 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 oedema noted particularly at the frontal and occipital horns. 

Case Discussion

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

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Case Information

rID: 7912
Case created: 23rd Dec 2009
Last edited: 29th Dec 2016
Inclusion in quiz mode: Included

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