HIV common cerebral lesions .
Toxoplasmosis = multiple ring enhancing lesions >>> sulfadiazine +pentamidine+folinic acid .
Crytococcal meningitis= very high CSF pressure with lymphocytosis and positive India ink >>>> steroids plus antifungal IV.
CMV encephalitis = infarction like lesions with excess protein and mononuclear leucocytosis in CSF >>> IV Ganciclovir