braintumors

concentrically arranged whorled patterns

menigioma

psammoma bodies

meningioma

second most common primary brain tumor

meningioma

arises from arachnoid cells external to brain

meningioma

pseudopalisading" pleomorphic tumor cells with central areas of necrosis

glioblastoma

cerebellopontine angle

schwannoma

S-100 positive

schwannoma

bilaterally schwannoma found in�

neurofibromatosis type 2

fried egg -- round nuclei with clear cytoplasm

oligodendroglioma

chicken-wire capillary pattern

oligodendroglioma

rathke's pouch

pituitary adenoma, craniopharyngioma

bitemporal hemianopia

pituitary adenoma

adult tumors in order of incidence

GBM, meningioma, schwannoma, oligodendroglioma, pituitary adenoma

rosenthal fibers -- eosinophilic corkscrew fibers

pilocytic astrocytoma

cystic and solid

pilocytic astrocytoma

rosettes or pervascular pseudorosette pattern of cells

medulloblastoma

solid (gross), small blue cells (hits)

medulloblastoma

PNET

medulloblastoma

can compress 4th ventricle, causing hydrocephalus

medulloblastoma

perivascular pseudorosettes with rod-shaped blephharoplasts near nucleus

ependymoma

found in 4th ventricle, cause hydrocephalus

ependymoma

associated with von Hippel-Lindau when found with retinal angioma

hemangioblastoma

produce EPO --> secondary to polycythemia

hemangioblastoma

foamy cells, highly vascular

hemangioblastoma

calcification is common

craniopharyngioma

most common supratentorial tumor

craniopharyngioma

childhood tumors in order of incidence

pilocytic astrocytoma, medulloblastoma, ependymoma, hemangioblastoma, craniopharygioma