Check T1 first
- T1 hyperintense
- T1: only a few things are hyper intense on T1
- Fat
- Lipoma
- Dermoid cyst
- Chronic blood (metHb) → paramagnetic
- Haemorrhagic tumour/met
- Pituitary apoplexy
- Thrombosed aneurysm
- Paramagnetic ions
- Ca
- Mn
- Melanin
- Chelates paramagentic ions
- Ca
- Mg
- Fe
- Cholesterol crystal
- Colloid cyst
- Slow flow
- Molecular motion = Lamour fq → allows of stealing of energy → shorter T1 recovery.
- Eg
- Meningioma
- Craniopharyngioma
- Schwannoma
- Chordomas
- Chondrosarcomas
- Mnemonic
- 3 Fs and 4 Ms
- F: fat
- F: slow flow
- F: proteinaceous fluid
- M: melanin
- M: methaemoglobin
- M: mineralisation
- M: Magnevist (gadolinium contrast)
T2 hyperintense
- Water
- Edema
- Fat
- Blood
- Most tumours
T1 contrast enhancement
No enhancement | Homogenous enhancement | Patchy enhancement | Ring enhancement |
Low grade astrocytoma | Mets | Mets | Mets |
Dermoid Cyst | Lymphoma (Immunocompetent) | Oligodendroglioma | Lymphoma |
Epidermoid cyst | Germionoma and other pineal gland tumours | GBM | GBM |
Arachnoid cyst | Pituitary macroadenoma | Radiation necrosis | Abscess infectious disease MS |
Solid components of • Pilocystic astrocytoma • Haemangioblastoma | Chronic haematoma | ||
Ganglioglioma | |||
Meningioma and schwannoma |
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