CNS V (brain tumor)

Question 1

classifiction of brain tumor to three thirds

Answer 1

1. gliomas
2. metastasis
3. non glial tumours

Question 2

the most common type of gliomas is

Answer 2

astrocytoma

Question 3

radiological features of glioma

Answer 3

1. Solitory Irregular mass, surrounded by edema, with mass effect.
2. Usually low density, but may be high or mixed density with calcification
3. Pre/post-contrast should be performed for accurate detection.

Question 4

The most common adult primary intracranial neoplasm

Answer 4

Glioblastoma

Question 5

glioma of adult and child

Answer 5

1. adult Glioblastoma (poor prognosis)
2. child Pilocytic Astrocytoma

Question 6

characters of meningioma

Answer 6

Arise from meninges of vault, falx, or tentorium.
Dense than brain on unenhanced CT bc of calcif..
Marked contrast enhancement.
Sclerosis, bone thickening.
thickening and enhancement of the local dura.

hint: mass + enhacement + bone thickning = meningioma

Question 7

the most common site of meningioma

Answer 7

1. parasagittal region over the cerebral convexities
2. the sphenoid ridges

Question 8

radiological features of acoustic neuroma

Answer 8

1. Arise in the internal auditory canal adjacent to the internal auditory meatus
2. In the cerebellopontinr angle
3. visible on CT if large (MRI preferred)
4. Contrast improves visibility

Question 9

D.Dx of CPA masses are:

CPA = cerebellopontine angle

Answer 9

[AMEN]
A: acoustic schwannoma (~80%).
M: meningioma (~10%).
E: ependymoma (~5%).
N: neuroepithelial cyst (arachnoid/epidermoid) (~5%).