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1H MR spectroscopy of pilocytic astrocytoma. Short echo time (TE) spectra of a supratentorial (A) and infratentorial (B) pilocytic astrocytoma and corresponding MR images indicating the regions of interest are shown. Pilocytic astrocytoma spectra are noisy because of the low cellularity of the lesions. Absolute quantitation revealed low creatine (Cr) concentrations. High lactate (Lac) and prominent total choline (tCho) and N-acetylaspartate (NAA) relative to creatine were noted.
