Cogwheel sign in pelvic imaging

The Cogwheel sign in pelvic imaging refers to an imaging appearance of thickening loops of the Fallopian tube seen on cross section. There are infolding projections (sometimes look like nodules)  into the Fallopian tube lumen which is likened to that of a cogwheel. The sign is typically described on ultrasound and is indicative of tubal inflammation in pelvic inflammatory disease with a pyosalpinx or a hydrosalpinx.

Share article

Article Information

rID: 23365
System: Gynaecology
Section: Signs
Tag: cases
Synonyms or Alternate Spellings:
  • Cogwheel sign in pelvic ultrasound
  • Cogwheel sign - pelvic ultrasound
  • Cogwheel sign - hydrosalpinx

Support Radiopaedia and see fewer ads

Cases and Figures

  • Drag
    Cogwheel sign of ...
    Case 1
    Drag here to reorder.
  • Updating… Please wait.
    Loadinganimation

    Alert accept

    Error Unable to process the form. Check for errors and try again.

    Alert accept Thank you for updating your details.