Must-Knows Flashcards
Most common cerebellopontine angle (CPA) tumors
Acoustic neuroma
Meningioma
Lesion in frontal eye field vs seizure
Frontal eye field lesion: deviation towards lesion
Seizure: deviation to opposite
What does DWI enhances?
Stroke, abscess, epidermoid
EDH is associated with what? Crossing sutures and falx?
Associated with skull fracture (and pneumocephalus).
Don’t cross sutures. Can cross falx
Operative indication for EDH
Especially > 30 cc
Nonsurgical ok in 8GCS, no deficit (ALL requirements)
When to operate for compression fracture?
3 contiguous levels or wedge fracture
Where is the tegmen?
Tegmentum typamni - between cranial and tympanic cavities, thin bone
What can cause vertebral dissection?
Archery, sneezing, sudden neck movement
Gradenigo sign
CN6 palsy, retro-orbital pain, draining ear (mastoiditis spreading along petrous bone and CN6)
Annulus of Zinn
Divides components of superior orbital fissure
Cavernous aneurysm - typical progression
Fistulize upon rupture, may cause mass effect before
PCA runs through what?
Ambient cistern (lateral to the medulla)
How do you present a scan on rounds?
This is a , then
How do you calculate midline shift?
Use the septum pellucidum
Path of CN 3 and 6
Very medial, right over clivus. Also for 4 and 5
Decrease ICP can cause what?
Bilateral CN6 palsy
Most common site for intraventricular meningioma
Left trigone of lateral ventricle
What is the inferior venous drainage for temporal lobe?
Inferior anastomotic vein of labbe
Neurosarcoid can present as what?
Multiple cranial neuropathy
What are gelastic seizures
hypothalamic seizures caused by hamartoma
Sellar lesion differential
SATCHMOL Sarcoid/pit adenoma Aneurysm Teratoma Craniopharyngioma/RCC/Chordoma Hamartoma Meningioma/mets Optic glioma Lymphoma
Postop transphenoidal triple phase
1) DI due to acute injury
2) cell death cause release and transient SIADH
3) delayed DI
Mollaret’s
Epidermoid cysts can give rise to aseptic meningitis
Lillequist’s membrane
Separates interpeduncular cisterns from chiasmatic cistern - localizes SAH
Transsphenoidal anatomy
Superiorly: circular sinus connects cavernous sinus - site of bleeding
Midline in sphenoid is the rostrum.
Subdural membrane
Immune/inflam rxn to chronic blood - why we need to evacuate clot to prevent from reforming a membrane
Posterior pituitary on T1
Enhances
Mega cisterna magna
Between cerebellum and dorsal surface of medulla oblongata. Large cisterna magna is benign. Ddx include arachnoid cyst.
Herniated disc level lateral vs posterolateral vs lumbar stenosis
Posterolateral: level below
Far lateral: level above
Lumbar stenosis: level above
