Clinical information:

The patient was admitted to our hospital because of a large cerebellar mass that was diagnosed in an outside institution. A surgery was performed. The followings are the representative photos of this mass.

A. Squash	B. Frozen	C.	D.	E.	F.
G.	H.

Panel A was a cytologic preparation (squash preparation) and Panel B was the frozen section obtained on intraoperative consultation respectively. Panel C, D, and E were permanent sections obtained from representative areas. Panel F, G and H were cerebellar tissue that was included in the specimen.

Questions:

• What is the approximate age of this patient?
• What is your diagnosis?
• How would you confirm your diagnosis? Discussion