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. 2018 Dec 22;38:74. doi: 10.1186/s40880-018-0338-4

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Contrast-enhanced sagittal magnetic resonance imaging (MRI) of the head and neck of a patient before and after surgery. a PRNN (indicated by the red arrow) was located in the roof of the posterior wall of the nasopharyngeal cavity and oral pharynx as shown on the preoperative MRI. b The flap (indicated by the blue arrow) re-surfaced the defect after radical endoscopic necrectomy, with good blood supply at 2 weeks after surgery. c The flap completely relined the nasopharyngeal mucosa at 8 weeks after surgery