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Year 3 St Peter's Hospital Tutorials > CT Head > Flashcards

CT Head Flashcards

1
Q

What sort of radiation is used in CT?

A

X rays

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2
Q

What are the 2 main divisions of the brain?

A

Supratentorial and infratentorial regions

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3
Q

Which structure separates the frontal and parietal lobes?

A

Central sulcus

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4
Q

What is the L sign?

A

Way of identifying central sulcus

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5
Q

What lies behind the lateral ventricles?

A

Thalamus

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6
Q

Name the 3 cisterns in the brain

A

Suprasellar
Quadrigeminal
Sylvian

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7
Q

Which of the dura has the most protective role for the brain?

A

Arachnoid mater

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8
Q

What shape is an extradural haematoma on CT?

A

Lens

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9
Q

Why does extradural haematoma cause “talk and die” syndrome?

A

Haematoma grows until ICP > BP and blood can’t enter brain —> suddenly drop dead

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10
Q

Which patients are most at risk of subdural haematoma?

A

Subdural

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11
Q

Which type of blood vessel is damaged in a subdural haematoma?

A

Veins

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12
Q

Where does the circle of Willis occupy?

A

Suprasellar cistern

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13
Q

See photos

A

Subarachnoid haemorrhage due to Berry aneurysm

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14
Q

What is the most common cause of intracerebral haemorrhage?

A

Malignant HTN

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15
Q

Which arteries perfuse the basal ganglia?

A

Lenticulostriate arteries

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16
Q

For how many hours will an ischaemic stroke appear normal?

A

3

17
Q

How will an old infarct appear on CT?

A

Region of darkness as there is less blood (which is white)

18
Q

What are the 3 main vascular territories of the brain?

A

Anterior, middle and posterior cerebral arteries

19
Q

What is vomiting indicative of in cases of head trauma?

A

Extradural haemorrhage raising ICP

20
Q

If a pt has a fall that causes him to have clear fluid leaking from nose, what is that fluid?

A

CSF

21
Q

What causes bright white lesions on CT head?

A

Calcification due to SOL

Year 3 St Peter's Hospital Tutorials (9 decks)

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