Tubal ring sign

Tubal ring sign also referred to as bagel sign or blob sign, one of the ultrasound signs of a tubal ectopic. It comprises an echogenic ring that surrounds an unruptured ectopic pregnancy. It is said to have a 95% positive predictive value (PPV) for ectopic pregnancy.

Differential diagnosis

It can be mimicked by a normal corpus luteum. To differentiate the two, bimanual examination can be useful to differentiate an ovarian corpus luteum (moves with ovary) from a tubal ectopic (moves separately from the ovary). Normal ovarian tissue may also be noticeable around a corpus luteum.

Article information

rID: 2219
Section: Signs
Synonyms or Alternate Spellings:
  • Tubal ring sign of an ectopic pregnancy
  • Bagel sign
  • Blob sign

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Cases and figures

  •  Case I
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