Myocardial Infarction in a 7-Year-Old Girl with Polyarteritis Nodosa

Figure 1

(a) Mesoappendix and part of the appendix. Necrotizing vasculitis in mesoappendix small- to medium-sized arteries is evident. There is no inflammation in the appendix mucosa and muscularis propria. Low magnification. H & E stained slide. (b) Segmental transmural necrotizing inflammation. In the involved artery/arteriole, there is fibrinoid necrosis, neutrophils and eosinophils which associated with lumen narrowing. There are no granulomas. High magnification. H & E stained slide.

(a)

(b)