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16 Cards in this Set
- Front
- Back
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Basic Physics of DWI
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T2 Weighted
Brownian Motion - thermally induced motion of water in living tissue. Utilizes diff. gradients before and after the 180 degree pulse of FSE echo planar sequence with various B values Typically B0 and B1000 |
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What is ADC
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Apparent Diffusion Coefficient
Is a calculated sequence derived from the DWI using the "Tanner Equation". |
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Extraconal Masses
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1-Benign mixed tumor, lacrimal
2-Lymphoproliferative lesions anywhere in orbit esp lacrimal 3-idiopathic orbital inflam. dz 4-hematoma, orbit |
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Intraconal Masses
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1-Glioma, optic pathway
2-Meningioma 3-Pseudotumor 4-Cavernous Hemangioma 5-Retrobulbar Hematoma |
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Saccular Aneurysm Locations
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ACA/ACOM 35%
CA/PCOM 35% MCA bifurcation 20% Basilar 5% |
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Ring-enhancing Lesions
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MAGIC DR
Metastasis Abscess Glioma / Giant Aneurysm Infarct Contusion Demyelinating disease Resolving hematoma |
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Hemorrhagic Tumors
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Glioblastoma multiforme (GBM) - most common overall
Metastasis - second most common overall Oligiodendroglioma - second most common primary tumor |
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Calcified Glial Tumors
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Old Elephants Age Gracefully (in order of frequency)
Oligodendroglioma Ependymoma Astryocytoma Glioblastoma multiforme (GBM) |
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Posterior Fossa Masses in Children
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Medulloblastoma
Juvenile pilocytic astrocytoma Ependymoma Brainstem glioma |
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Congenital Brain Tumors in Infants Younger Than 60 Days of Age
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Teratoma
Primitive neuroectodermal tumors Astrocytoma Choroid plexus papilloma Ependymoma Medulloepithelioma Germinoma Angioblastic meningioma Ganglioglioma |
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Pineal Region Masses
Germ Cell Tumors (60%) |
Germinoma
Teratoma Embryonal carcinoma Endodermal sinus tumor Choriocarcinoma |
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Pineal Region Masses
Pineal Parenchymal Tumors (14%) |
Pineocytoma
Pineoblastoma |
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Pineal Region Masses
Others |
Pineal cyst
Glioma Meningioma (tentorial) Vein of Galen aneurysm Arachnoid cyst Lipoma |
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Supersellar Masses
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SATCHMO
Sella tumor, Sarcoid Aneurysm, Arachnoid cyst Teratoma Craniopharyngioma Hypothalmic glioma, Hamartoma of tuber cinereum, Histiocytosis Meningioma Optic glioma |
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Cerebellopontine Masses
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SAME
Schwannoma (80%) Arachnoid Cysts (4%)Meningioma (11%) Ependymoma,epidermoid (4%) |
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Masses of the Antero-Superior Third Ventricle
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Colloid cyst
Meningioma Choroid plexus papilloma Hamartoma Glioma Vascular lesion Granulomatous lesion |
