1 Fifth stage Radiology Lec-9 د. هديل5/4/2016 CT of the brain tumors & abdomen Brain tumors : Meningioma Benign tumor arise from the arachnid cells of the meningeal covering of the brain are most common primary intracranial neoplasm Usually present in middle age female it is well defined extra axial , located mainly at the convexity of the skull periphery rounded or sessile , plaque like , specially the tumor arise from the cribriform plate , or those arise from the petrus bone , planum spheniodale , or from skeleton of the pituitary fosse . CT finding meningioma presented as isodense area or slightly hyper density area with surrounded crescent of hypo density ( csf cap ) post contrast injection the lesion enhance homogeneously with enhancing Dural tail . 20 % show calcification hyperostosis & thickening of the near by bony part of the skull & diplioc space . it may be associated with little or no peri focal edema . if the lesion associated with central necrosis with large perifocal edema meningio sarcoma should be excluded .
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Fifth stage Radiology
Lec-9
5/4/2016 د. هديل
CT of the brain tumors & abdomen
Brain tumors :
Meningioma
Benign tumor arise from the arachnid cells of the meningeal covering of the brain are
most common primary intracranial neoplasm
Usually present in middle age female
it is well defined extra axial , located mainly at the convexity of the skull periphery
rounded or sessile , plaque like , specially the tumor arise from the cribriform plate ,
or those arise from the petrus bone , planum spheniodale , or from skeleton of the
pituitary fosse .
CT finding
meningioma presented as isodense area or slightly hyper density area with
surrounded crescent of hypo density ( csf cap ) post contrast injection the lesion
enhance homogeneously with enhancing Dural tail .
20 % show calcification
hyperostosis & thickening of the near by bony part of the skull & diplioc space .
it may be associated with little or no peri focal edema .
if the lesion associated with central necrosis with large perifocal edema meningio
sarcoma should be excluded .
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Glioma
Comments primary interracial tumor , vary greatly in malignancy , have many names
depending on the histological type :
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astrocytoma
oligodendroglioma both of them are well differentiated slowly growing t.
gliobtastoma multiforme G IV highly malignant t. named also as butterfly G. arise
from the anterior or posterior aspect of the corpus callosum , extend & spread to
both cerebral hemispheric sides
grading of malignancy of G. depending on the following :
well defined or irregularity of the lesion
surrounding edema present or absent
associated shifting of midline & crossed midline lesion