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Ultrasonic manifestation of urethral polyp in a girl: a case report. Urethral polyp, a rare condition, occurs frequently in boys but seldom in young girls. In this report, we describe a case of a six-year-old female patient who experienced dysuria for eight days. Color ultrasound of the patient's urinary system revealed a solid nodule 14×9 mm in size at the opening of the urethra in the trigonal area of the bladder. The nodule was connected to the urethra's posterior wall, and no blood flow signal could be detected. The primary diagnosis was urethral mass. A F7 ureteroscope was used as the cystourethroscope and was inserted into the bladder via the external opening of the urethra. Biopsy forceps were used to remove pathological lesions from the uplifted mucosa and submucosa. The postoperative pathological report was urethral polyp. When a child experiences intermittent urine retention, intermittent hematuria, and intermittent lower urinary tract symptoms, urethral polyp should be considered first.