“…Introital US was performed under standardized conditions using a vaginal 5-9 MHz probe of Ultramark HDI C9-5 ICT (ATL, Hamburg, Germany) with pressure-free probe application. 2,3,9 US was performed according to the guidelines for performing lower urinary tract US as part of urogynecologic functional assessment issued by the German Association of Urogynecology. 4 With the patient in the semi-sitting position and a standardized bladder volume of about 300 ml, the US probe was positioned in the area of the vaginal introitus at the external urethral orifice without applying pressure and aligning the axis of the probe to the patient's long body axis (i.e., in coronal and sagittal planes) by one experienced sonographer.…”