Neoplasms of CNS Flashcards
what does the suffix blast indicate?
embryonic/undifferentiated cells
what do all primary CNS cancers end with?
Oma
are adult neoplasms commonly supra or infratentorial?
supratentorial
are child neoplasms commonly supra or infratentorial?
infratentorial
name two common grade 1 benign neoplasms of CNS
neurofibroma and meningioma
what does enhancement signal in CNS neopplasms?
disruption of the BBB
what indicates disruption of BBB in MRI?
contrast enhancement in T1 MRI
what is the most common childhood malignant CNS neoplasm?
medulloblastoma
where is medulloblastoma found?
in cerebellum
what is histo finding with medulloblastoma?
homer wright rosettes
what are homer wright rosettes?
small blue cells found in medulloblastoma
what can medullblastoma cause in ventricular system?
blockage of fourth ventricle…so non communicating hydrocephalus
what can medulloblastoma send to spinal cord?
drop metastes
what grade is pilocytic astrocytoma?
grade I
what is cell issue in pilocytic astrocytoma?
low grade astrocytoma so astrocyte is issue
what is most common benign childhood neoplasm?
pilocytic astorcytoma
what does pilocytic astrocytoma stain + for?
GFAP
where is pilocytic astrocytoma most often found in kids?
cerebellum
what are the two components of the pilocytic astrocytoma?
cystic portion and solid mass
do pilocytic astrocytoma and medulloblastoma enhance or not enhance contrast on MRI?
both enhance it
if there is a pilocytic astrocytoma in the optic nerve, what is it called?
optic glioma
what is histo finding in pilocytic astrocytoma?
rosenthal fibers
what are rosenthal fibers?
eosinophilic corkscrew fibers..in pilocytic astrocytoma
what are ependymomas from?
ependymal cells
where is ependymomas found?
4th ventricle
is ependymoma a good or bad prognosis?
not so great
what is histo finding of ependymoma?
perovascular pseudorosette
what is a perivascular pseudorosette?
ependymoma histo finding
what can ependymoma do to spinal cord?
send drop metasteses
what can ependymoma cause in ventricular system?
hydrocephalus