NQ-004: A 21 year-old woman with a cerebellar mass and drop metastasis in the spinal cord. This photo was obtained from the intraoperative cytologic preparation. Which of the followings would be the most likely diagnosis?

A.    Pilocytic astrocytoma

B.    Medulloblastoma

C.    Choroid plexus papilloma

D.    Ependymoma

E.    Atypical teratoid/rhabdoid tumor