Yang H, Gu JJ, Jiang L, et al. - This study was undertaken to investigate the imaging features of urethral and peri-urethral masses on transvaginal or transperineal ultrasound (US) in a cohort of 95 women. This retrospective study was examined medical records of 95 female patients with 98 asymptomatic or symptomatic urethral and peri-urethral masses. They extracted data regarding patient demographic characteristics, symptoms, signs, imaging features on 2-D and 3-D transvaginal or transperineal US, diagnostic tests and physical and intra-operative findings. They compared US imaging features and clinicopathologic characteristics of each urethral or peri-urethral mass. This research verified transvaginal or transperineal 2-D and 3-D ultrasonography to be a valid, non-invasive, cost-effective diagnostic modality for the differential diagnosis of urethral and periurethral masses.