The primary intracerebral malignancies that may cause drop metastases to the subarachnoid space are:
- glioblastoma (GBM) and anaplastic astrocytoma
- medulloblastoma
- sPNET
- ependymoma
- germinoma
- choroid plexus carcinoma
- pineoblastoma/pineocytoma
These can be remembered using this mnemonic:
- Gruesome Masses Progressively Extend Caudally
- MPEG
- GEM
- PPPG GAME
Mnemonic
Gruesome Masses Progressively Extend Caudally
- G: GBM, germinoma
- M: medulloblastoma
- P: pineocytoma, PNET
- E: ependymoma
- C: choroid plexus carcinoma
MPEG
- M: medulloblastoma
- P: pineocytoma, PNET
- E: ependymoma
- G: GBM, germinoma
GEM
- G: GBM, germinoma
- E: ependymoma
- M: medulloblastoma
PPPG GAME (#PUPG GAME)
- P: PNET
- P: Pineblastoma
- P: Pineocytoma
- G: GBM
- G: Germinoma
- A: Anablastic glioma
- M: Medulloblastoma
- E: Epedymoma
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