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23 Cards in this Set
- Front
- Back
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What are the 2 categories of vein of galen malformation
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choroidal
mural |
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Which type of VGAM occurs in infants
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mural
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What is a mural type of VGAM
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few feeders from uni- or bilateral collicular or posterior choroidal arteries
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What is a choroidal type of VGAM
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multiple feeders from pericallosal, choroidal, and thalamoperforating arteries
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neonates
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choroidal
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infants
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mural
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What is the appearance of a VGM on US
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anechoic lesion posterior to 3rd ventricle w/flow on Doppler, usually w/hydrocephalus
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Do neonates with VGM often present with hydrocephalus
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yes
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What is the appearance of a VGM on CT
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mildly hyperdense lesion posterior to 3rd ventricle in region of quadrigeminal plate cistern
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What is better for evaluating a VGM; CT or MR
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MR
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What is something that must be adhered to when injecting contrast for an angio in a pt with VGM
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inject as little contrast as needed b/c of CHF risk
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What type of compression of the spinal cord is caused by a synovial cyst
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extradural
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What is the radiographic appearance of a synovial cyst
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Round, sharply-marginated mass immediately adjacent to a degenerated facet (with fluid in facet), lateral to thecal sac
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What is the signal characteristic of a synovial cyst
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csf
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What are the CT findings in a pt with a synovial cyst
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fluid density w/soft tissue rim which may be Ca+ or have rim enhancement
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Can a synovial cyst have signal characteristics other than CSF
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yes, it may be bloody and therefore variable
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Where do synovial cyst arise from
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these arise from the facet joints
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What is the course of an abberant ICA
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AbICA enters posterior middle ear cavity from below, hugs cochlear promontory as it crosses middle ear, then joins posterior lateral margin of horizontal petrous ICA
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What is the cause of an abberant ICA
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Congenital vascular anomaly resulting from failure of formation of extracranial ICA with arterial collateral pathway
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What is a clue that there is an abberant ICA on CT
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Normal bony partition b/w ICA and middle ear is missing
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What is a common clinical sign of an abberant ICA
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pulsatile tinnitus
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What is the main ddx of an abberant ICA
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glomus tympanicum (on single coronal image, o/w Aunt Minnie get axial)
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What other tumor may arise from the cochlea promotory
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Glomus tympanicum which is a benign tumor arising from glomus bodies situated on cochlear promontory
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