05-04-2009, 09:26 PM
34yr man with AIDS suddenly falls to the floor and has a tonic-clonic seizure.His concerned frineds call paramedics,who take him to hospital.On arrival at the hospital he is conscious,but confused.P/E is remarkably for cachexia and oral thrush.Neurological exam reveals isolated weakness of lateral gaze on the right.MRI reveals multicentric mass lesions in the brain and meninges.One of the masses is biopsied and appropriate immunohistochemical stains are performed.From which of the following cell types did the masses most likely derive?
Astrocyte
B lymphocyte
Ependymal cell
Melanocyte
Oligodendrocyte
Astrocyte
B lymphocyte
Ependymal cell
Melanocyte
Oligodendrocyte