a

b

. Irreversible tubal occlusion with a microinsert. (a) Scout radiograph obtained prior to the instillation of contrast material shows a microinsert that has been placed hysteroscopically into the proximal fallopian tube. (b) Radiograph obtained after instillation shows no contrast material filling of the fallopian tube beyond the microinsert, a finding that helps document tubal occlusion.

http://radiographics.rsna.org/content/26/2/419.figures-only