Both authors underline the need for a uniform evaluation of the CS scar, establishing an internationally accepted definition of a niche. In our Delphi study, it was agreed that a niche should be defined as an indentation at the site of the CS scar with a depth of at least 2 mm. 2 Scioscia M, Iannone P, Morano D, Pontrelli G, Greco P. Comment on "Longitudinal transvaginal ultrasound evaluation of cesarean scar niche incidence and depth in the first two years after single- or double-layer uterotomy closure: a randomized controlled trial". [Extracted from the article]