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In human anatomy, the omental foramen (epiploic foramen, foramen of Winslow after the anatomist Jacob B. Winslow, or uncommonly aditus; Latin: Foramen epiploicum), is the passage of communication, or foramen, between the greater sac (general cavity (of the abdomen)), and the lesser sac.

Borders

It has the following borders:

anterior: the free border of the lesser omentum, known as the hepatoduodenal ligament. This has two layers and within these layers are the common bile duct, hepatic artery, and hepatic portal vein. A useful mnemonic to remember these is DAVE: Duct, Artery, Vein, Epiploic foramen.
posterior: the peritoneum covering the inferior vena cava
superior: the peritoneum covering the caudate lobe of the liver
inferior: the peritoneum covering the commencement of the duodenum and the hepatic artery, the latter passing forward below the foramen before ascending between the two layers of the lesser omentum.
left lateral: gastrosplenic ligament and splenorenal ligament

As the portal vein is the most posterior structure in the hepatoduodenal ligament, and the inferior vena cava lies under the posterior wall, the epiploic foramen can be remembered as lying between the two great veins of the abdomen.

Additional images

Diagram to show the lines along which the peritoneum leaves the wall of the abdomen to invest the viscera.
Epiploic foramen

References

This article incorporates text in the public domain from page 1156 of the 20th edition of Gray's Anatomy (1918)

External links

"Omental foramen". Medcyclopaedia. GE.
Anatomy photo:37:08-0100 at the SUNY Downstate Medical Center – "Abdominal Cavity: The Omental Foramen"
Anatomy image:7826 at the SUNY Downstate Medical Center
Anatomy image:7831 at the SUNY Downstate Medical Center
Anatomy image:7875 at the SUNY Downstate Medical Center
peritoneum at The Anatomy Lesson by Wesley Norman (Georgetown University)
abdominalcavity at The Anatomy Lesson by Wesley Norman (Georgetown University) (xsectthrulesseromentum)

UpToDate Contents

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1. 腹膜垂炎epiploic appendagitis [show details]
…abdomen and can be confused with a neoplastic process. Epiploic appendagitis, also known as appendicitis epiploica, hemorrhagic epiploitis, epiplopericolitis, or appendagitis, is an ischemic infarction of an …
2. 小腸および大腸の腹部超音波検査transabdominal ultrasonography of the small and large intestine [show details]
…peritonitis and pylephlebitis) can also be detected during ultrasonography. Epiploic appendagitis (also known as appendicitis epiploica) is a rarely recognized disease of the colonic epiploicae . Its main clinical …
3. 成人における腹痛の原因causes of abdominal pain in adults [show details]
…gastrointestinal tract is affected. Epiploic appendagitis – Epiploic appendagitis (also known as appendicitis epiploica, hemorrhagic epiploitis, epiplopericolitis, or appendagitis) is a benign and self-limited …
4. 気管領域の手術を行う際の麻酔管理anesthesia for tracheal surgery [show details]
5. 腹腔鏡下手術の合併症complications of laparoscopic surgery [show details]

English Journal

Caecal volvulus incarcerated in the epiploic foramen.

Lawson J, Ghaly M.
ANZ journal of surgery. 2019 Jun;89(6)E259-E260.
PMID 29266691

Surgical treatment of epiploic foramen entrapment in 142 horses (2008-2016).

van Bergen T, Haspeslagh M, Wiemer P, Swagemakers M, van Loon G, Martens A.
Veterinary surgery : VS. 2019 Apr;48(3)291-298.
To report the clinical features, outcomes, and prognostic factors associated with the surgical treatment of epiploic foramen entrapment (EFE). Retrospective study at a single referral hospital. Horses (n = 142) undergoing surgery (n = 145) for EFE. Preoperative, perioperative, and postoperat
PMID 30666674
PMID 29489171

Japanese Journal

子宮留膿症からの子宮穿孔により急性汎発性腹膜炎を発症した子宮頸癌の１例

梅田杏奈,串本卓哉,福井薫 [他],小野良子,数見久美子,宮西加寿也,朴康誠,山本敏也
産婦人科の進歩 65(1), 83-89, 2013
子宮穿孔は比較的まれな疾患である．原因の多くは妊娠中や子宮に関する手術後，子宮留膿症などの良性疾患であり，子宮頸癌を合併した症例の報告はこれまでに6例のみである．今回われわれは，子宮留膿症からの子宮穿孔により急性汎発性腹膜炎を発症した子宮頸癌の症例を経験したので報告する．症例は41歳，未経妊．数カ月前より不正性器出血を自覚していた．徐々に下腹部痛が出現，発熱を認めたため近医内科受診し，補液，解熱剤 …
NAID 130003362657

回腸の網嚢孔エントラップメントによる馬の急性腹症手術例

畠添孝,藤木誠,小松耕史 [他],三角一浩
日本獣医師会雑誌 = Journal of the Japan Veterinary Medical Association 61(2), 131-135, 2008-02-20
小腸絞扼による疝痛症状の馬を開腹手術した.拡張した空腸容積を減じ, 盲腸から逆行性に小腸の体外露出を試みたが, 暗黒色化した回腸以前を引き出せなかった.変色部の網嚢孔内嵌入を腹腔内で確認し, 左-右方向の網嚢孔エントラップメントと診断した.小腸を減圧しながら, 右から左へと, 嵌頓を解除し空盲腸吻合を行った.麻酔時間4時間50分, 麻酔終了後2時間で起立したが, その後8時間で死亡した.剖検では, …
NAID 10025573638

胃特発性ａｂｄｏｍｉｎａｌ　ａｐｏｐｌｅｘｙの１例

伊東功,向井正哉,向山小百合,田島隆行,中崎久雄,幕内博康
日本臨床外科学会雑誌 64(12), 3048-3051, 2003
症例は69歳,男性.通勤途中に突然臍周囲の激痛にて近医を受診し,急性腹症,消化管穿孔疑にて当院に搬送された.来院時血圧は60mmHgとショック状態で,軽度の貧血と著明な腹膜刺激症状を認めた.腹部CT検査上,腹腔内出血と胃体部後壁に壁外に突出する腫瘤を認めた.上腸間膜動脈閉塞症や絞扼性イレウスも否定できず緊急手術を施行した.開腹時,腹腔内に約800gの血腫を認めたが,出血源は確認できなかった.胃後壁 …
NAID 130003603436

「網嚢孔」

Omental foramen
	Horizontal disposition of the peritoneum in the upper part of the abdomen.
	Entry to omental bursa (black arrow) by omental foramen (white mark)
Details
Identifiers
Latin	foramen omentale
TA	A10.1.02.403
FMA	14711
	Anatomical terminology [edit on Wikidata]