MRI of the brain
Loading Stack -
0 images remaining
MRI with contrast demonstrates a large heterogeneous mass arising form the left thalamus and growing exophytically into the the lateral ventricle. It is associated with dilatation of both lateral ventricles, in keeping with obstruction of their out-flow at the foramen of Munro. Areas of the mass are intrinsically high on T1 weighted imaging and show signal drop out on T2 weighted sequences, suggestive of haemorrhage, and on DWI the mass is quite high signal (low on ADC - not shown) consistent with a degree of restricted diffusion, suggesting high cellularity. Following contrast administration the mass heterogeneously enhances.
In the posterior fossa, particularly on the ventral surface of the brainstem is leptomeningeal enhancement, likely representing CSF seeding.