There has been significant growth in the recurrent right side of posterior fossa tumour when compared to three months ago. It is associated with prominent oedema in the adjacent displaced the right cerebellar hemisphere, distorting the 4th ventricle without obstruction to CSF outflow. Cerebellar tonsils are low-lying, displaced inferiorly below the foramen magnum. Upper cervical cord is unremarkable in appearance. Enhancement is, as before, minimal, and the tumour bulk demonstrates lower values on ADC maps consistent with hypercellularity in the known diagnosis of medulloblastoma.
The remainder of the brain is unremarkable, with no convincing abnormal enhancement elsewhere.
T2 and T1 post contrast volumetric imaging for the purposes of stereotaxis has also been obtained.
Conclusion: Significant recurrent medulloblastoma growth.