Added Value of Three-dimensional Transvaginal Ultrasound (3D TVUS) and Gel Infusion Sonography (3D GIS) Compared With Magnetic Resonance Imaging (MRI) in the Diagnosis of Patients With Suspicion of a Uterine Septum.

Inclusion Criteria: * Women aged between 18 and 45 years * With suspicion of a uterine septum on routine 2D TVUS * Who are willing to give informed consent Exclusion Criteria: * Women aged below 18 years and over 45 years * Prior definitive diagnosis of a uterine septum or other congenital uterine anomaly * Prior surgery in relation to a uterine septum * Cervical (unilateral) aplasia * Vaginal aplasia * Untreated obstructive vaginal septum * Any co-morbidity that is found to interfere with the uterine measurements required in the study * Contraindications for MRI * Not willing or not possible to undergo transvaginal ultrasound * Pregnancy at the time of inclusion * Wish to conceive between inclusion and last diagnostic intervention * Visual or pathological evidence of cervical, uterine or ovarian malignancy * Patients with an intrauterine device (by mistake), who are not willing to remove this device before the start of the diagnostic interventions