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Majós C, Alonso J, Aguilera C, Serrallonga M, Acebes JJ, Arús C, Gili J. Adult primitive neuroectodermal tumor: proton MR spectroscopic findings with possible application for differential diagnosis. Radiology. 2002 Nov;225(2):556-66. doi: 10.1148/radiol.2252011592. PMID: 12409595.