Footnotes

• BH and GN contributed equally.

• Handling editor Mary Frances McMullin.

• Contributors BH, GN and KNN wrote the paper. BH and GN performed the literature review. All authors were involved in critical appraisal. GN, SC, DM and JA treated the patient clinically. EY-F, LB, AR, NK and KNN made the pathological diagnosis.

• Competing interests None declared.

• Patient consent for publication Not required.

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