Flashcards in Neuroradiology + Embryology Deck (14):
How do you distinguish a CT from MRI?
CT- (see teeth) bone is white, CSF is black
What neurological suspected pathology would require a CT scan?
Headache (red flag for tumour/ subarachnoid)
Post Surgical- hydrocephalus, Haemorrhage
What neurological presentation would be contraindicative to a CT?
No open/ depressed skull fracture
No CSF leakage
No panda eyes
<2 vomiting episodes
What type of imaging shows white CSF?
What does bone look like vs fat on an MRI?
Dark bone surrounded by white fat
What neurological suspected pathology would require an MRI scan?
Spine- IV disk prolapse
Headache- IC Hypertension
What physical/ psychological complications would prevent a Pt from an MRI scan?
Implants- electronics, cardiac pacemakers, defibs, cochlear implants
Moveable- Aneurysm clips, heart valves, recent intra-abdominal clips
What is the purpose of an angiography?
Look for large vascular (arterial + venous) abnormalities
Carotid Cavernous Fistula
Unstoppable epistaxis (nosebleed)
What is the purpose of Ct perfusion?
See the volume of blood passing through a defined volume of tissue per unit of time
Look for strokes (Dec perfusion), Tumour (INc perfusion- angiogenesis, aggressive)
What is the purpose of a PET Scan?
Map out glucose usage (inc metabolism in tumour, inflammation + infection). useful after brain tumour resection for differentiating granulation tissue (low energy use) from leftover tumour (high energy use)
What embryological layer does the nervous system develop from?
The 3 primary brain vesicles (forebrain, midbrain + hindbrain) develop into 5 secondary vesicles what are the adult derivatives of these?
1. Tiencephalon- Hemispheres, Hippocampus, Basal Ganglia
2. Diencephalon- Thalamus (+hypo), Pituitary, Pineal
3. Mesencephalon- Sup + Inf Colliculi
4. Metencephalon- cerebellum + pons
5. Myelncephalon- Medulla
What is the difference between gyrus + sulci? How are they formed?
Folds as a results of rapid growth to give more space