Brain imaging Flashcards
when is MRI most useful?
pituitary gland or brain stem
What colour is hyperdense?
white
what is hyperdense on CT?
bone and high density tings
what is hyperdense on T1 MRI?
fat, melanin, protein, contrast
what is hyperdense on T2 MRI?
fluid
what is hypodense on CT?
blood, air, fat, oedema
what is hypodense on T1 MRI?
fluid
what is hypodense on T2 MRI?
fat
T1 MRI grey matter is
grey
T1 MRI white matter is
white
T2 MRI grey matter is
white
T2 MRI white matter is
grey
TACI
total anterior circulation infarct
dysphasia, visuospatial disturbances, motor and sensory deficits
PACI
partial anterior circulation infarct
POCI
posterior circulation infarct
cranial nerve palsy
contralateral motor sensory deficit
eye movement problems
cerebellar dysfunction
what is a lacunar stroke?
occlusion of one of the penetrating arteries that provides the brain’s deep structures
subarachnoid haemorrhage features
within sulci and/or gyri
usually due to circle of willis bleeding
subdural haemorrhage features
sickle shaped
damage to cortical arteries
bleeding from underlying parenchyma
tearing of bridging veins from the cortex to draining veins
extradural haemorrhage features
lentiform shaped
fractured parietal/temporal bone which damages middle meningeal artery or vein between dura and skull
appearance of haemorrhage over time
hyperdense at acute stage
isodense
then hypodense when old
commonest causes of subarachnoid haemorrhage?
intracranial arterial aneurysms
peri-mesenceohalic haemorrhage
vascular abnormalities
presentation of SAH
thunderclap headache
vomiting
low GCS
treatment of extradural haemorrhage
burr hole
coup-contrecoup injury
soft tissue damage on one side bleeding on other side
