MRI without & C+ & MR Spectroscopy
Large tumour that consists of both enhancing solid component and multiple cystic components with marked surrounding oedema, centered within the right frontal lobe.
It causes subfalcine herniation to the left and obstructs the third ventricle at the level of foramen of Monro resulting in marked hydrocephalus. Mass effect on midbrain causing shift of midbrain to the left and uncal herniation.
MR spectroscopy obtained from the solid enhancing component of the lesion demonstrates a markedly increased choline peak, consistent with the high cellularity of this mass. An NAA peak is not seen. The solid components of the tumor show restricted diffusion.
The differential diagnosis includes primitive neuroectodermal tumor, atypical rhabdoid/teratoid tumor, anaplastic ependymoma, extraventricular neurocytoma and desmoplastic infantile ganglioglioma.