MR appearance

The proximal prostatic urethra and the spongy urethra are not demonstrated on MR imaging unless a Foley catheter is in-situ. On T2W1 axial images, the membranous urethra appears as a low signal intensity ring surrounded by high signal intensity epithelium.

The female urethra is 4.0cm long and passes from the bladder neck to the vaginal vestibule, opening directly anterior to the vaginal orifice and behind the clitoris. It lies anterior to, and describes a course parallel to the axis of the vagina. It passes with the vagina through the urogenital diaphragm. The ducts of multiple para-urethral glands open onto the vestibule on each side of the external urethral orifice.

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