A 38 year old female was seen for "fever of unknown origin" (FUO).In addition to fever,she was experiencing abdominal pain.Finally,it was decided that an appendicectomy was required,as her pain seemed to favour the right lower quadrant.The appendix was essentially normal microscopically,but a small artery in the fat surrounding the appendix demonstrated the findings seen in the accompanying photomicrograph.Which one of the following is the best diagnosis?

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Polyarteritis nodosa is often diagnosed accidentally,as in the vignettEMultiple small or medium arteries are typically involveDTreatment is immune suppression with corticosteroids or other drugs.

A 38 Year Old Female Was Seen for "Fever of Unknown