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Diagnostic Radiology > Neuroradiology > Flashcards

Neuroradiology Flashcards

1
Q

Choroid plexus

A

Site of CSF production

Body
Temporal horns
Third ventricle
Fourth ventricle

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2
Q

Obex

A

Opening of ventricles to spinal canal

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3
Q

Four recesses of the third ventricle

A

Chiasmatic (Supraoptic) recess

Infundibular recess

Suprapineal recess

Pineal recess

Cerebral aqueduct

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4
Q

Massa intermedia

A

Interthalamic adhesion: connects bilateral thalami

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5
Q

Foramen of Monro

A

Connects the lateral ventricles and third ventricle

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6
Q

Transtentorial herniation

A 
Medial temporal lobe, uncus
Goes under the tentorium
Compresses: cerebral peduncle, CN III, PCA
Duret hemorrhages
Upward: compresses foramen of aqueduct
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7
Q

Three types of herniations

A

Subfalcine
Transtentorial
Cerebellar tonsillar

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8
Q

Subfalcine herniation

A

cingulate gyrus
under falx cerebri
compresses ACA
foramen of Monro obstruction (contralateral hydrocephalus)

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9
Q

Cerebellar tonsillar herniation

A

compresses medulla (respiratory centers) –> fatal

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10
Q

Reduced diffusivity

A

Water ions trapped inside cells

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11
Q

Fourth ventricle

A

drains into the subarachnoid space and basal cisterns via foramena (Magendie and Luschka)

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12
Q

NO choroid plexus in

A

cerebral aqueduct

occipital horns

frontal horns

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13
Q

Ventricular volume

A

25 mL

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14
Q

Subarachnoid space volume

A

125 mL

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15
Q

Total CSF volume

A

150 mL

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16
Q

CSF production/day

A

500 mL/day

Replenished 3-4x/day

17
Q

Arachnoid granulations

A

absorb CSF

extend into dural venous sinuses

(produced by choroid plexus)

18
Q

CSF absorbed by:

A

arachnoid granulations
lymphatics
cerebral veins

19
Q

Causes of edema:

A

cell death
altered capillary permeability
hemodynamic forces

20
Q

cytotoxic edema

A

cell death

21
Q

vasogenic edema

A

increased capillary permeability

22
Q

interstitial edema

A

hemodynamics

23
Q

CN III palsy

A

eye is down and out

pupillary dilation

24
Q

Duret hemorrhages

A

upper brainstem hemorrhages

2/2 shearing of perforating vessels by herniation

25
Q

Communicating hydrocephalus

A

NPH, SAH

26
Q

Subarachnoid hemorrhage

A

can impede arachnoid granulation reabsorption of CSF

27
Q

Noncommunicating hydrocephalus

A

third ventricular colloid cyst

posterior fossa mass obstructing fourth ventricle

28
Q

Extra-axial

A

outside of the pia mater

29
Q

Basal cisterns

A 
Suprasellar 
Prepontine
Interpeduncular
Ambient
Quadrigeminal

Diagnostic Radiology (2 decks)

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