TUMORS Flashcards

1
Q

Classification of astrocytoma

A

diffuse well-differentiated astrocytoma (grade II), anaplastic astrocytoma (grade ill), and glioblastoma (glioblastoma multiforme, or “GBM,” grade N

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2
Q

The grade I classification for astrocytomas is reserved for the relatively benign group that includes

A

pilocytic astrocytomas (well-differentiated tumors mostly of children and young adults); the pleomorphic xanthoastrocytoma (with lipid-filled cells), and the subependymal giant cell astrocytoma (associated with tuberous sclerosis).

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3
Q

The ependymomas are subdivided into

A

cellular, myxopapillary, clear cell, and mixed types

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4
Q

a “tumor-like formation that has its basis in maldevelopment”

A

hamartoma

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5
Q

indicate all tumors composed of primitive-looking cells,

A

blastoma

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6
Q

Because of this capacity to transform the cellular genome, the virus product is called an ____; such oncogenes are capable of immortalizing, so to speak, the stimulated cell to form a tumor.

A

oncogene

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7
Q

mutations in the genes that code for i________ are common in gliomas and oligodendrogliomas and their presence relates to less tumor progression

A

socitrate dehydrogenase(IDH1 and 2)

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8
Q

____ have combined deletions in chromosomes 1p and 19q respond well to chemotherapy and this property increases survival

A

oligodendrogliomas

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9
Q

in approximately 50 percent of gliomas there is an overexpression or a mutant form of ______ and of _____, suggesting a role for these in the progression of certain tumor types

A

epidermal growth factor receptor (EGFR) plateletderived transforming growth factor receptor (PDGFR)

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10
Q

alters sensitivity of the glioma to chemotherapy

A

MGMT, a methyltransferase

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11
Q

These high-grade gliomas account for approximately 20 percent of all intracranial tumors and for more than 80 percent of gliomas of the cerebral hemispheres in adults.

A

G l i o b l a sto m a M u ltifo r m e a n d A n a p l a stic Ast rocyto m a

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12
Q

extraneural mets of GBM

A

bone and lymph nodes

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13
Q

gross findings of GBM

A

variegated appearance, being a mottled gray, red, orange, or brown, depending on the degree of necrosis and presence of hemorrhage, recent or old.

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14
Q

histology of GBM

A

The characteristic histologic findings of glioblastoma are hypercellularity with pleomorphism of cells and nuclear atypia; identifiable astrocytes with fibrils in combination with primitive forms in many cases;

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15
Q

This ______ appearance distinguishes glioblastoma from the anaplastic astrocytomas, which show frequent mitoses and atypical cytogenic features but no grossly _____

A

variegated necrotic or hemorrhagic areas

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16
Q

The vasculature and fibroblasts of glioma can undergo a sarcomatous transformation giving the tumor a mixed appearance that is termed ____

A

gliosarcoma

17
Q

More recently, the progression of astrocytomas and oligodendrogliomas to more malignant forms has been related to ____

A

the enzyme isocitrate dehydrogenase, encoded by the genes IDH1 and IDH2

18
Q

natural hx of untreated glioblastima

A

Fewer than 20 percent of patients survive for 1 year after the onset of symptoms and only about 10 percent live beyond 2 years

19
Q

how to give TMZ

A

The drug is administered daily (75 mg/m2) concurrently with radiotherapy and, after a hiatus of 4 weeks, given for 5 d every 28 d for 6 cycles.

20
Q

high levels of a methyltransferase protein (MGMT) in some glioblastomas lead to_______

A

resistance to chemotherapy

21
Q

________have been developed in response to the upregulation of EGFR

A

Tyrosine kinase inhibitors (erlotinib, gefitinib)

22
Q

Almost all glioblastomas recur within _____ of their original site and 10 percent develop additional lesions at distant locations.

A

2 em

23
Q

Antiangiogenic agents such as________ a VEGF inhibitor, sometimes given in combination with chemotherapy, may delay progression and greatly reduce cerebral edema, therefore diminishing the requirement for corticosteroids, but also do not prolong survival

A

bevacizumab,

24
Q

_____ is a slowly growing tumor of infiltrative character with a tendency in some cases to form large cavities or pseudocysts

A

Cerebral astrocytoma

25
Q

In children, astrocytic tumors usually arise in the ________

A

cerebellum

26
Q

survival rate of cystic astrocytoma of cerebellum

A

the rate of survival 5 years after successful surgery has been greater than 90 percent

27
Q

variant of high-grade glioma there is a diffuse infiltration of neoplastic glial cells, involving much of one or both cerebral hemispheres with sparing of neuronal elements but without a discrete tumor mass

A

G l i o m atos i s C e re b ri

28
Q

more widespread than the macroscopic picture suggests. If there is a syndrome that can be associated early on with gliomatosis, in our experience it has been a nondescript _______ sometimes mistaken for depression or a subacute dementia, or pseudobulbar palsy may be the first manifestation

A

frontal lobe behavioral syndrome

29
Q

2 types of ependymoma

A

one was the ependymoma, and the other, with more malignant and invasive properties, the ependymoblastoma, now recognized as an anaplastic ependymoma

30
Q

There is also a_________ of ependymoma, localized exclusively in the filum terminale of the spinal cord

A

myxopapillomatous type

31
Q

The most common cerebral site of ependymoma is the ________

A

fourth ventricle

32
Q

_________are identified by their high mitotic activity and endothelial proliferation, nuclear atypia, and necrosis.

A

Anaplastic ependymomas

33
Q

The most frequent acquired genetic defects of meningiomas are truncating (inactivating) mutations in the ___________

A

neurofibromatosis 2 gene (merlin) on chromosome 22q.

34
Q

Meningiomas also elaborate a variety of soluble proteins, some of which _______are angiogenic and probably relate to both the highly vascularized nature of these tumors

A

(VEGF)

35
Q

Because the clusters of arachnoidal cells penetrate the_______, these are the sites of predilection for the tumor.

A

dura in largest number in the vicinity of venous sinuses

36
Q

MC meningioma subtype

A

meningothelial (syncytial)

37
Q

findings of meningioma in angiography

A

“tumor blush” on angiography