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Flashcards in Must-Knows Deck (29)
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1

Most common cerebellopontine angle (CPA) tumors

Acoustic neuroma
Meningioma

2

Lesion in frontal eye field vs seizure

Frontal eye field lesion: deviation towards lesion
Seizure: deviation to opposite

3

What does DWI enhances?

Stroke, abscess, epidermoid

4

EDH is associated with what? Crossing sutures and falx?

Associated with skull fracture (and pneumocephalus).
Don't cross sutures. Can cross falx

5

Operative indication for EDH

Especially > 30 cc
Nonsurgical ok in 8GCS, no deficit (ALL requirements)

6

When to operate for compression fracture?

3 contiguous levels or wedge fracture

7

Where is the tegmen?

Tegmentum typamni - between cranial and tympanic cavities, thin bone

8

What can cause vertebral dissection?

Archery, sneezing, sudden neck movement

9

Gradenigo sign

CN6 palsy, retro-orbital pain, draining ear (mastoiditis spreading along petrous bone and CN6)

10

Annulus of Zinn

Divides components of superior orbital fissure

11

Cavernous aneurysm - typical progression

Fistulize upon rupture, may cause mass effect before

12

PCA runs through what?

Ambient cistern (lateral to the medulla)

13

How do you present a scan on rounds?

This is a , then

14

How do you calculate midline shift?

Use the septum pellucidum

15

Path of CN 3 and 6

Very medial, right over clivus. Also for 4 and 5

16

Decrease ICP can cause what?

Bilateral CN6 palsy

17

Most common site for intraventricular meningioma

Left trigone of lateral ventricle

18

What is the inferior venous drainage for temporal lobe?

Inferior anastomotic vein of labbe

19

Neurosarcoid can present as what?

Multiple cranial neuropathy

20

What are gelastic seizures

hypothalamic seizures caused by hamartoma

21

Sellar lesion differential

SATCHMOL
Sarcoid/pit adenoma
Aneurysm
Teratoma
Craniopharyngioma/RCC/Chordoma
Hamartoma
Meningioma/mets
Optic glioma
Lymphoma

22

Postop transphenoidal triple phase

1) DI due to acute injury
2) cell death cause release and transient SIADH
3) delayed DI

23

Mollaret's

Epidermoid cysts can give rise to aseptic meningitis

24

Lillequist's membrane

Separates interpeduncular cisterns from chiasmatic cistern - localizes SAH

25

Transsphenoidal anatomy

Superiorly: circular sinus connects cavernous sinus - site of bleeding
Midline in sphenoid is the rostrum.

26

Subdural membrane

Immune/inflam rxn to chronic blood - why we need to evacuate clot to prevent from reforming a membrane

27

Posterior pituitary on T1

Enhances

28

Mega cisterna magna

Between cerebellum and dorsal surface of medulla oblongata. Large cisterna magna is benign. Ddx include arachnoid cyst.

29

Herniated disc level lateral vs posterolateral vs lumbar stenosis

Posterolateral: level below
Far lateral: level above
Lumbar stenosis: level above