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AJNR - American Journal of Neuroradiology

Published ahead of print on October 9, 2007
doi: 10.3174/ajnr.A0750

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Pineocytoma Mimicking a Pineal Cyst on Imaging: True Diagnostic Dilemma or a Case of Incomplete Imaging?

S. Fakhran^a and E.J. Escott^b

^a Department of Radiology, University of Pittsburgh Medical Center, Pittsburgh, Pa
^b Department of Radiology, Section of Neuroradiology, University of Pittsburgh Medical Center, Pittsburgh, Pa

View larger version (59K): [in this window] [in a new window]   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.