Figure 1

Histologic findings. a) Low power view of rupture site with free mucin and a dysplastic intestinal-type gland (arrow). b) Low power view of normal appendix epithelium with underlying endometriosis. c) Low power view of endometriosis of the appendix wall with transition to intestinal-type epithelium (arrows). (d and e) Further low power views of endometriosis of the appendix wall with transition to intestinal-type epithelium. f) Higher power view of 1e. Note intestinal-type epithelium (arrow). g) High power view of endometriosis, intestinal-type metaplasia, and intestinal-type metaplasia with low-grade atypia (arrows left to right). h) High power view of an area of tufting in low grade dysplasia.