Footnotes

• Contributors ZR made the final diagnosis, initiated writing the case report, wrote the draft of the article and made photographs of routine histology and immunohistochemistry. TJ made the preliminary diagnosis, referred the case to ZR and reviewed the manuscript. JS performed and interpreted the molecular studies, made FISH photographs and discussed the manuscript. FC provided the clinical data, and cowrote the manuscript.

• Competing interests None.

• Patient consent Obtained.

• Provenance and peer review Not commissioned; externally peer reviewed.