Demyelination
Radionecrosis/hematoma
Metastasis
Abscess (consider bacterial, fungal, parasitic)
Glioma (and other primary neoplasms such as lymphoma)
Infarction
Contusion
Toxoplasmosis v. lymphoma (see comparison of characteristics at Radiopaedia.org.)
Primary brain tumor
Primary CNS lymphoma
Metastatic disease
Pyogenic brain abscess
Tuberculoma
Toxoplasmosis
Syphilis
Neurocysticercosis
Nocardiosis
Cryptococcosis
Aspergillosis
Multiple Sclerosis
Sarcoidosis
Vasculitis
Aneurysm
Resolving hematoma
Cerebral infarct
Post-op changes
Ring-enhancing lesion
Demyelination
Ingrown toenail
Radionecrosis/hematoma
Intracranial mass
Metastasis
Eponyms
Abscess 