Fig 3.

Choroid plexus papilloma and choroid plexus carcinoma. Short echo time (TE) MR spectra of a supratentorial (A) and a infratentorial (B) choroid plexus papilloma and of a choroid plexus carcinoma (C) with corresponding MR images indicating the regions of interest. Choroid plexus papilloma shows a prominent myo-inositol peak, whereas creatine (Cr) is hardly detectable. In contrast, more malignant choroid plexus carcinoma shows a prominent choline peak, whereas myo-inositol is not elevated. The insert in spectrum A displays a long TE spectrum obtained from the same region of interest. The long TE spectrum is used to rule out glycine contributing to the mI peak.