The Collaborative International Dictionary of English v.0.48:

Cerebroscopy \Cer`e*bros"co*py\, n. [Cerebrum + -scopy.] (Med.)
   Examination of the brain for the diagnosis of disease; esp.,
   the act or process of diagnosticating the condition of the
   brain by examination of the interior of the eye (as with an
   ophthalmoscope). --Buck.
   [1913 Webster]