“Perifollicular rim sign” in an enlarged ovary—an additional non-contrast CT finding in ovarian torsion

Prem P. Batchala, Pankaj Nepal, Baphiralyne Wankhar, Shanmugavel Chinnakaruppan, Maneesh Khanna, Vijayanadh Ojili

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: To look for the presence of “perifollicular rim sign” on non-contrast CT in surgically proven cases of ovarian or adnexal torsion. Methods: A retrospective analysis of abdominopelvic non-contrast CT examinations in surgically proven cases of ovarian or adnexal torsion was conducted seeking the presence of “perifollicular rim sign” in torsed ovaries. “Perifollicular rim sign” was defined as a complete ring of perifollicular hyperdensity around ovarian follicles with an attenuation value of > 50 HU and thickness > 1–2 mm. A positive sign was equated to the presence of perifollicular hemorrhage. Pre-operative non-contrast CT was available in 7 out of the 39 ovarian or adnexal torsions included in our study. Results: “Perifollicular rim sign” was present in 5 out of the 7 ovarian torsions on pre-operative non-contrast CT. MRI correlation was available in one patient. Ovarian enlargement (>4 cm) was present in all 7 cases. Conclusion: In an appropriate clinical setting, presence of “perifollicular rim sign” in an enlarged ovary on non-contrast CT examination can be considered a useful additional sign for ovarian torsion.

Original languageEnglish (US)
Pages (from-to)621-626
Number of pages6
JournalEmergency Radiology
Volume28
Issue number3
DOIs
StatePublished - Jun 2021

Keywords

  • CT
  • Ovarian torsion
  • Perifollicular hemorrhage

ASJC Scopus subject areas

  • Emergency Medicine
  • Radiology Nuclear Medicine and imaging

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