Lacrimal sac fistulas.
D005402:Fistula / Q000000981:diagnostic imaging*; D006801:Humans; D007765:Lacrimal Apparatus / Q000000981:diagnostic imaging*; D007766:Lacrimal Apparatus Diseases / Q000000981:diagnostic imaging*; D009301:Nasolacrimal Duct / Q000000981:diagnostic imaging*; D011859:Radiography