fistul-, fistulo-, fistuli- +
(Latin: pipe; an abnormal passage or communication, usually between two internal organs, or leading from an internal organ to the surface of the body)
Cross references of word families related directly, or indirectly, to: "internal organs, entrails, inside": ent-; enter-; incret-; inter-; intra-; splanchn-; viscer-.
A cross reference of word units that are related, directly and/or indirectly, with "tube, pipe": aulo-; can-, cann-; siphon-; syringo-; tub-.