Keywords: Tumors, CEST & MT, Amide Proton Transfer ImagingAtypical features of Pilocytic astrocytoma (PA) on conventional MR imaging are often challenging and can be mistaken as High-grade glioma. Advanced Novel techniques of Amide Proton Transfer (APT) and Arterial spin labelling (ASL) have shown promising results in the grading of gliomas. This study to explore the added value and utility in characterizing the atypical form of PA, if these two non-contrast techniques are combined in the clinical practice. Mismatch between APT and ASL signals, was seen in all the cases of PA and this unique imaging appearance of APT ASL imaging mismatch could be a biomarker for pilocytic astrocytoma.
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