Footnotes

• Contributors I certify that neither this manuscript nor one with substantially similar content under my authorship has been published or is being considered for publication elsewhere. I have access to any data upon which the manuscript is based and will provide such data upon request to the editors or their assignees. I have given final approval of the submitted manuscript for which I take public responsibility for whole content. According to the definition given by the International Committee of Medical Journal Editors (ICMJE), all named authors qualify for authorship based on making substantial contributions to the intellectual content. I, AP, am the corresponding author and I prepared the initial draft of the manuscript. VL reviewed and amended the initial draft. RK was the consultant of the patient; he identified the case, provided the images, reviewed and amended the final version of the manuscript.

• Competing interests None.

• Patient consent Obtained.

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