3. Cerebellopontine angle
• Location-almost triangular space located In
posterior cranial fossa and contains CSF
• Relations-
Central structures- CNVII & CNVIII
Superiorly- CNV
Inferiorly-CNIX,CNX &CNXI
4. Vestibular Schwanoma
• Vestibular neuroma is a benign, slow growing,
encapsulated tumor of vestibulocochlear (8th
CN) cranial nerve.
• It is also known as
-Acoustic neuroma
-Acoustic neurilomma
-CPA tumor
-Angle tumor
5. Epidemiology
• 10 in 1 millions
• In USA-2000-30000 cases are diagnosed each year
• 95%-Sporadic
• 5%- associated with NF2-usually bilateral-early
incidence
• Epidemiological classification
1.silent tumors
2. symptomatic undiagnosed tumors
3.diagnosed tumors
6. Classification
• According to size of tumor
a. intracanalicular- confined with in IAC
b. small size- (up to 1.5 cm)
c. medium size- (1.5-4 cm)
d. large size- (>4 cm)
10. Pathology
• Gross
-Small to large size
-encapsulated
-slowly growing
-medial to IAC and lateral to CPA
• Microscopic
-Antoni A cells
-Antoni B cells
14. 5th CN - numbness of face
-reduced corneal reflex
9th & 10th CN-dysphasia
-horseness of voice
11th & 12th ,3rd, 4th, 6th CN –if tumor is very large
• Brainstem involvement
-ataxia
-weakness and numness of arms and legs
-exagerated tendon reflex