Table 4.

 Epithelialised and non-epithelialised fistulae of Crohn’s disease (CD) patients and controls by electron microscopy

Sex	Age at surgery (y)	Location of fistula	Epithelialised/non-epithelialised	Disease
Male	31	Sigma	Epithelialised	CD
Male	33	Terminal ileum	Epithelialised	CD
Male	71	Perianal	Non-epithelialised	CD
Female	42	Perianal	Epithelialised	Non-CD
Female	73	Sigma	Epithelialised	Non-CD
Male	34	Perianal	Non-epithelialised	Non-CD