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Hi, me again, sorry to take so much space.
Your first 2 photos are almost identical to the AFIP fasicle Vol7 (4th ed) by Peter Burger and Bernd Scheithauer, on page 302, fig6-14 to 6-17 describes of papillary tumor of the pineal region. But this lesion only reported in adult patients so far. please double check patient's MRI to see if this lesion related to pineal gland. Also, to see in low power if there is any papillary structure on your case. By the book, papillary tumor of the pineal region should be positive for CK, and NSE, variably for S-100, synaptophysin and chromogranin.
Please let me know if I can be any helpful.
Thanks for your case.