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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