Confluence of predecidua between multiple arterioles is the hallmark of day 24 endometrium.
IMAGE DESCRIPTIONS
Day 24 endometrium demonstrates confluence of predecidua between multiple arterioles. Note that the thin layer of predecidua has not yet formed underneath the surface epithelium, which is a feature of day 25 endometrium.
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BACKGROUND
In late secretory endometrium (day 23-27), the presence of predecidualization and its location is key to dating.
- Day 23, the predecidua is located around the individual spiral arterioles.
- Day 24, the predecidua bridges multiple vessels.
- Day 25, the predecidua forms a thin, discontinous band beneath the superficial epithelium.
- Day 26, the predecidua forms a thick continuous band beneath the superficial epithelium.
- Day 27, the predecidua is mostly confluent in the stroma.
REFERENCES
1 Mazur MT, Kurman RJ. Diagnosis of Endometrial Biopsies and Curettings. New York, NY: Springer; 2005: 12-19.
2 Nucci MR, Oliva Esther. Gynecologic Pathology: Foundations in Diagnostic Pathology. Philadelphia, PA: Elsevier: 2009: 202-4.
Last updated: 2010-10-21
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