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. 2016 Feb 11;14:35. doi: 10.1186/s12957-016-0777-9

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© Kim et al. 2016

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 — BPOP. A1 Sublingual ulceration with a whitish calcified mass. A2 Removed mass showing partial bluish color (arrows). A3 BPOP specimen was composed of cartilaginous (1) and osseous (2) tissue. A4 Bizarre chondrocytes (arrows) in cartilaginous tissue. B HE stain. B1–B3 (area 1 of A3). B4, B5 (area 2 of A3). B1 and B3 show core cartilage covered with thick perichondral fibrous tissue. B4 and B5 show anastomosing trabecular bone centered from cartilaginous tissue, mimicking endochondral ossification. C–G IHC stains with no background stain. C PCNA. D BMP-2. E BMP-4. F RUNX2. G OC