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Tumors with CSF seeding:
choroid plexus papilloma, ependymoma, PNET (medulloblastoma), piineoblastoma, germinoma, GBM
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Hyperdense lesion on CT:
lymphoma, medulloblastoma/PNET, ependymoma, germinoma, GBM, hemorrhagic mets, mucinous mets, osteogenic tumor, hemorrhage, meningioma, colloid cyst, aneurysm
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Calcified intraparenchymal lesions:
oligodendroglioma, ependymoma, mucinous adenoCA, osteogenic sarcoma, toxoplasmosis, CMV, cysticercosis, TB, AVM, aneurysm, TS, Sturge-Weber, hematoma;
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Calcified sellar lesions �
meningioma, craniopharyngioma, germ cell tumor, aneurysm
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T2 hypointense lesions:
ferritin, hemosiderin, deoxyhemoglobin, intracellular methemoglobin, melanin, calcification, lymphoma, myeloma, neuroblastoma, fibrous tissue (meningioma), high protein concentration, flow void
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T1 hyperintense lesions:
Gd, methemoglobin, melanin, certain states of calcium, fat (dermoid), high protein concentration (colloid cyst), slow flow
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