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Figure 1: (a and b) Magnetic resonance imaging brain of case 1 showing a heterogeneously contrast enhancing mass arising in the pineal region with associated hydrocephalus. (c) Photomicrograph showing a tumor with papillary pattern with a fibrovascular core (H and E, ×100); (d) higher magnification of the same area showing moderate nuclear pleomorphism and frequent mitotic activity [arrow], (H and E, ×400), (e) the tumor cells showing strong positivity for pan cytokeratin (IP, ×400)

Figure 1: (a and b) Magnetic resonance imaging brain of case 1 showing a heterogeneously contrast enhancing mass arising in the pineal region with associated hydrocephalus. (c) Photomicrograph showing a tumor with papillary pattern with a fibrovascular core (H and E, ×100); (d) higher magnification of the same area showing moderate nuclear pleomorphism and frequent mitotic activity [arrow], (H and E, ×400), (e) the tumor cells showing strong positivity for pan cytokeratin (IP, ×400)