Cerebellopontine Angle Masses

Front 1

Acoustic Schwannoma

Back 1

80% of CPA masses, benign.
Arise from the intracanalicular segment of the vestibular portion of vestibularcochlear nerveand when bilateral is highly suspicious for NF2
Vivid contrast enhancement on MRI. Smaller tumors tend to be solid but larger ones become cystic.
Have the trumpet IAM sign.
Differential diagnosis includes: meningioma, metastasis, and ependymoma.

Front 2

Chordoma

Back 2

1% of intracranial masses, malignant.
Most common location is sacro-coccygeal followed by spheno- occipital.
Arise in bone, are extradural and cause local bone destruction.
creates the "thumb sign"
CT: intratumoral calcification thought to be sequestra of normal bone. moderate to marked enhancement.
T1: intermediate to low signal.
T2: very high signal

Front 3

a

Back 3

a