Figure 11c. Embryonal carcinoma of the pineal gland in a 32-year-old man with double vision. The brain was examined with MR imaging. (a) Axial T2-weighted MR image shows a tumor with heterogeneous signal intensity in the pineal gland (arrows). (b) Axial contrast-enhanced T1-weighted MR image shows some enhancing foci within the tumor (arrows). (c) Photomicrograph (original magnification, x200; H-E stain) shows embryonal cells with an epithelial appearance growing in a tubular pattern. Glandular, papillary, and solid reticular patterns are also present.