M - Metastasis
A - Abscess
I - Infarct (subacute phase)
C - Contusion
D - Demyelinating disease (eg. tumefactive MS)
An alternative is DR MAGIC of course, which is what you may like to call yourself if you can remember the list! Although you can’t possibly know by looking at the single images, for what it is worth, the above cases are; A = metastasis, B = abscess, C = radiation necrosis, D = GBM, E = demyelination, F = contusion.