Cogwheel sign

The cogwheel sign refers to an imaging appearance in pelvic imaging of thickening loops of the Fallopian tube seen on cross-section. There are infolding projections (sometimes looking 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.

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

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Cases and figures

  • Case 1
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