Cumulus oophorus

Last revised by Dennis Odhiambo Agolah on 6 Aug 2022

Citation, DOI, disclosures and article data

Citation:

Morgan M, Agolah D, Weerakkody Y, et al. Cumulus oophorus. Reference article, Radiopaedia.org (Accessed on 08 Dec 2023) 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, Matt A. Morgan ◉

Disclosures:

At the time the article was created Matt A. Morgan had no recorded disclosures.

View Matt A. Morgan's current disclosures

Last revised:

6 Aug 2022, Dennis Odhiambo Agolah

Disclosures:

At the time the article was last revised Dennis Odhiambo Agolah had no recorded disclosures.

View Dennis Odhiambo Agolah's current disclosures

Revisions:

9 times, by 6 contributors - see full revision history and disclosures

Systems:

Gynaecology

Tags:

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

Synonyms:

Ovigerus
Proligerus disc
Cumuli oophori
Proligerus membrane
Discus proligerus

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