Niche definition and guidance for detailed niche evaluation

With interest we read the correspondence of Bamberg et al.1 and Scioscia et al.2 about the randomized controlled trial of the first authors concerning the uterine niche after caesarean section (CS).3 They state that at the time of the trial it was not established which technique should be used in the evaluation of a caesarean scar or niche in daily practice and future research. Both authors underline the need for a uniform evaluation of the CS scar establishing an internationally accepted definition of a niche. In their study a niche was defined as an anechogenic area at the site of the uterine scar with a depth of at least 1 mm