PMC3600218_01
MRI T2 coronal view: free fluid and inflammatory changes around the appendix (arrow). Gravid uterus.
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fig1
This scan showed mild periappendiceal fat stranding, suggestive of early acute appendicitis (Figure 1). 
Endometriosis H&E x100. A central endometrial gland surrounded by abundant decidualised endometrial stroma.
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fig2
There was an abundant decidualised endometriosis (Figure 2) within the wall of the appendix, as confirmed by CK7 and CD10 immunohistochemistry.
Well-differentiated endocrine tumour (classic carcinoid) H&E x200 Nests and cords of uniform, bland, cohesive tumour cells with round nuclei, stippled chromatin, and eosinophilic cytoplasm.
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fig3
In addition, at the tip of the appendix, there was a well-differentiated endocrine tumour (Figure 3) (G1, classic carcinoid) measuring 4.5 mm in maximum dimension, which was largely confined to the muscularis propria, but which very focally invaded (0.2 mm) subserosal tissues, in keeping with stage pT2 tumour.