Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
40 Cards in this Set
- Front
- Back
|
typical location for colloid cyst
|
anterior to 3rd ventricle
|
|
|
classic pt presentation for colloid cyst
|
HA that gets worse with change in position
|
|
|
complications from colloid cyst
|
can cause rapid obx hydrocephalus --> death
|
|
|
pathogenesis of colloid cyst
|
arises from embryonic endoderm
it contains goblet cells and ciliated cells |
|
|
how to tx colloid cyst
|
surgery
|
|
|
ct appearance of colloid cyst
|
rounded hyperdensity in foramen of monro on NECT
|
|
|
MR findings for colloid cyst
|
bright (or iso) on T1
iso on T2 may have rim enhancement BUT NO SOLID ENHANCEMENT WILL BE PRESENT!!!!! |
|
|
DDx for colloid cyst
|
neurocystercircosis (multiple lesions in parenchyma and cisterns)
subependymoma (usually frontal horn of lat vent) pituitary adenoma (rare) |
|
|
general features of an oligodendroglioma
|
well differentiated slow growing tumor
diffusely infiltrating in cortical and subcortical WM may cause bony remodeling hetergeneous with cystic and calcific areas. |
|
|
most common location of oligodendroglioma
|
frontal lobe
|
|
|
CT appearance of oligodendroglioma
|
heterogeneous mass with calcifications and cystic areas
50% enhance |
|
|
MR findings of oligodendroglioma
|
T1 iso to GM
T2 hetero and hyperintense FLAIR hetero DWI - negative |
|
|
DDx
|
astrocytoma (calcs are less common, but can be indistinguishable)
gangliogliomia (kids) HSV (will see restricted diffusion) |
|
|
general features of spinal cord ependymoma
|
location: c > t >conus
circumscribed enhancing cord mass wiht hemorrhage central canal expansion usually 3-4 vert body segments long +/- cysts (50-90%) |
|
|
DDx spinal cord ependymoma
|
astrocytoma (may be indistinguishable, astro is more common in kids)
hemangioblastoma (highly vascular with many flow voids, 1/3 have VHL) demyelinating dz (usually <2 vert body segments) |
|
|
MR findings of spinal cord ependymoma
|
T1 iso or hypo
T2 bright, similar to CSF , will see "cap sign" - area of dark adjacent to bright, secondary to hemosiderin CE MR homogeneous enhancement STIR - bright |
|
|
ct appearance of ependymoma
|
isodense lesion with coarse calcifcations, cystic change, and/or hemorrhage
|
|
|
most common location for ependymoma
|
*floor* of 4th ventricle (esp in kids; floor as opposed to roof, as in medulloblastoma)
in adults, will be supratentorial |
|
|
mr findings for ependymoma
|
iso on t1
bright on t2 intense heterogeneous enhancement |
|
|
location of subependymoma
|
>50% in 4th ventricles
lat ventricles also common |
|
|
ct appearance of subependymoma
|
isointense lesion
+/- hydrocephalus, calcs rarely, have cystic components |
|
|
MR appearance of subependymoma
|
dark on T1
bright on T2 variable enhancement |
|
|
central neurocytoma location
|
50% lateral ventricle
|
|
|
ct appearance of central neurocytoma
|
hyperattenuating lession associated with septum pellucidum
cyst-like areas calcifications |
|
|
mr appearace of central neurocytoma
|
bright on t1
iso on t2 variable enancement |
|
|
what is SEGA associated with
|
TS
|
|
|
location of SEGA
|
foramen of monro
|
|
|
what does SEGA stand for
|
subependymal giant cell astrocytoma
|
|
|
t or f
SEGA can often be seen in the absence of TS |
false
if SEGA is present, a w/u for TS should be done |
|
|
what age group gets SEGA
|
kids
|
|
|
CT findings of SEGA
|
calcifications
intense enhancement |
|
|
mr findings of sega
|
iso on T1
hetero increase on T2 homogeneous, intense enhancement hydrocephalus |
|
|
choroid plexus papilloma location
|
50% in lateral ventricle
|
|
|
morphology of choroid plexus papilloma
|
lobulated
|
|
|
ct findings of choroid plexus papilloma
|
lobulated, usually lat vent
hydrocephalus +/- calcs intense enhancement |
|
|
mr findings of choroid plexus papilloma
|
iso on T1
variable on T2 flow voids (highly vascular) intense enhancement |
|
|
who gets choroid plexus papillomas
|
kids
|
|
|
who gets chooid plexus carcinoma
location |
kids/infants
lat vent |
|
|
ct appearance of choroid plexus carcinoma
|
usually lat vent
brain invasion +/- calcs hterogeneous attenuation |
|
|
mr appearance of choroid plexus carcinoma
|
iso-hyper on T1
mixed on T2 + vasogenic edema heterogeneous enhancement |
