The neoplastic cells of this primary pineal tumor is most likely to be immunoreactive for:

1. Neurofilament proteins.

2. CD-117 (c-kit).

3. Synaptophysin.

4. Placental alkaline phosphatase (PLAP).

A. I, 2, and 3 are true.

B. Only 1 and 3 are true.

C. Only 2 and 4 are true.

D. Only 4 is true.

E. None of the above.

Answer and Discussion

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