Meckel's diverticulum.
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007413:Intestinal Mucosa; D008297:Male; D008467:Meckel Diverticulum / Q000175:diagnosis* / Q000601:surgery*; D008875:Middle Aged