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PT  - JOURNAL ARTICLE
AU  - Andre, E.
AU  - Xu, M.
AU  - Yang, D.
AU  - Siow, J.K.
AU  - Yeo, T.T.
AU  - Xu, Y.
AU  - Lim, C.C.T.
TI  - MR Spectroscopy in Sinus Mucocele: &lt;em&gt;N&lt;/em&gt;-Acetyl Mimics of Brain &lt;em&gt;N&lt;/em&gt;-Acetylaspartate
DP  - 2006 Nov 01
TA  - American Journal of Neuroradiology
PG  - 2210--2213
VI  - 27
IP  - 10
4099  - http://www.ajnr.org/content/27/10/2210.short
4100  - http://www.ajnr.org/content/27/10/2210.full
SO  - Am. J. Neuroradiol.2006 Nov 01; 27
AB  - SUMMARY: We describe MR spectroscopy in 2 patients with frontal sinus mucoceles that showed a dominant metabolite peak at 2.0-ppm chemical shift, simulating N-acetylaspartate (NAA) of normal neuronal tissue. In vitro analysis of postsurgical mucocele samples confirmed that the signal at 2.0 ppm was arising from the methyl moiety of an N-acetyl compound. This is probably caused by N-acetylgalactosamine or N-acetylglucosamine, which are glycoproteins found in normal respiratory mucus produced by the paranasal sinus epithelium.