Follicular ring sign

The follicular ring sign is considered as a characteristic sonographic sign for early diagnosis of ovarian torsion 1. It is defined as prominent (1-2 mm thick) hyperechoic margin seen concentrically around the antral follicles of the torsed ovary, which are usually small (3‐ to 7‐mm) and peripherally displaced.

The antral follicles in normal ovaries, can sometimes have hyperechoic margins due to acoustic enhancement, but they are imperceptible and not seen all around the follicle.

Article information

rID: 85847
System: Gynaecology
Section: Signs
Synonyms or Alternate Spellings:

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Cases and figures

  • Case 1: follicular ring sign in ovarian torsion
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