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Fig 1. A, Pineocytoma on precontrast MR image. Sagittal T1-weighted MR image (TR/TE = 500/17 ms) shows an ovoid lesion (arrow) that is hypointense to white matter and close to CSF in signal intensity, with a thin intermediate signal-intensity rim centered on the pineal recess. B, Pineocytoma on precontrast MR image. Axial T2-weighted MR image (TR/TE = 4000/90 ms) shows a homogeneous ovoid lesion (arrow), which is isointense to CSF in signal intensity with a thin intermediate-intensity rim centered on the pineal region. C, Pineocytoma on postcontrast MR image. Axial postcontrast T1-weighted MR image (TR/TE = 760/17 ms) shows a homogeneously enhancing mass (arrow) centered on the pineal recess. The homogeneous solid enhancement excludes the possibility of this tumor being cystic.
