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Cumulus oophorus

Last revised by Mr. Dennis Odhiambo Agolah on 06 Aug 2022

Citation, DOI & article data

Citation:

Morgan, M., Agolah, D. Cumulus oophorus. Reference article, Radiopaedia.org. (accessed on 18 Aug 2022) https://doi.org/10.53347/rID-42514

DOI:

https://doi.org/10.53347/rID-42514

Permalink:

https://radiopaedia.org/articles/42514

rID:

42514

Article created:

24 Jan 2016 by Dr Matt A. Morgan ◉

Revisions:

7 times by 4 users - see full revision history

System:

Gynaecology

Sections:

Tags:

ultrasound, pelvic ultrasound, ovary, normal variant, stub, cases

Synonyms:

Cumuli oophori
Proligerus membrane
Discus proligerus
Proligerus disc
Ovigerus

Cumulus oophorus refers to an appearance in the ovary in which multiple granulosa cells enlarge around a developing oocyte. These support cells ("cumulus cells") serve multiple functions in the maturation of the oocyte. They may occasionally be seen during a pelvic ultrasound, and should not be confused with a pathological finding.

60-65% of the time a cumulus oophorus is visualized 12-24 hours before ovulation ³.

It comprises a collection of the cells in a mature follicle that protrude into the cavity of the follicle. It is a sign of imminent ovulation, but its absence has little significance in predicting the maturity of the oocyte.

On ultrasound, the cumulus oophorus appears as a cyst along the wall of the dominant follicle