– Headache since 2 months, nausea, and vomiting.
– Papilledema but no loss of vision.
– MRI is made.
What is the most likely diagnosis?
Expansive mass in the midline centered in the clivus (basiocciput and basisphenoid) with high signal on FLAIR (upper left), intermediate to low T1 signal, high T2 signal, and moderate heterogeneous enhancement after contrast administration.
No diffusion restriction.
ADC value is around 1350. No dural tail.
No encasement of basilar artery.
Compression on pons but no invasive growth.
Upward displacement of chaism, anterior displacement of pituitary gland and stalk.
Does not fit with meningioma, pituitary macroadenoma, chondrosarcoma, lymphoma, or plasmacytoma.This
was histologically proven.