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From the case:
Quadrigeminal plate lipoma
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Info
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A mass in the quadrigeminal plate cistern, just below the pineal gland has high T1 and T2 signal and attenuates on fat saturated T1 C+ sequence. Additionally, it demonstrates prominent chemical shift artifact on the sagittal T2 and gradient-echo sequences. Features consistent with a lipoma.
Case Discussion
Appearances are typical of an intracranial lipoma. If fat saturated sequences are not available, then presence of chemical shift artifact is helpful in confirming the mass is fatty.