1.  What anatomical area or structure is involved by the pathologic process in this case?  Which side of the nervous system is involved?

2.  What accounts for the nystagmus observed on the neurologic examination?  Does this indicate that two separate areas of the nervous system are involved by the pathologic process?

3.  In general, what type of pathologic process do you think is involved in this case?

Pathologic Diagnosis:  Left cerebellar dermoid cyst

4.  What diagnostic procedure(s) would you undertake at this point?