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. 2015 Feb 24;9:41. doi: 10.1186/s13256-015-0525-8

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© Kobayashi et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Gross appearance of the primary tumor. (A) The tumor was located in the median upper lip, was well-defined, measured 9×12mm in diameter, and was elastic and hard. (B) Partial ulceration of the mucous membrane was evident.