Cesarean scar niche
The term Cesarean scar niche (defect) refers to the presence of a hypoechoic area within the myometrium in the isthmus (lower uterine segment) with discontinuation of myometrium at the site of previous Cesarean section scar. A niche has been described as the indentation of myometrium of around 1-2 mm and due to tethering of the endometrium
They may come in various shapes such as
- semicircular: considered commonest
- triangular: next commonest
- droplet‐shaped
- inclusion cysts
Due to tethering of the endometrium, blood accumulates in a niche and may serve as a source of dysfunctional uterine bleeding, accounting for spotting 2-12 days after the routine menstrual cycle.
See also
