Urethrocele is defined as:

Urethrocele is accurately defined as the prolapse of the urethra into the vagina. This condition occurs when the support structures of the urethra weaken, leading to a downward displacement of the urethral tissue into the vaginal canal. This displacement can cause various symptoms, including urinary incontinence, discomfort during sexual intercourse, and urinary tract infections.

The anatomical consideration is essential here; the urethra is located anteriorly to the vagina, so when it prolapses, it does so into the vaginal space. Understanding this concept is critical for recognizing symptoms and implementing the appropriate clinical management for patients presenting with this type of pelvic organ prolapse.

The other options refer to different types of prolapses involving various pelvic structures, but none accurately describe urethrocele. For instance, the details defining the prolapse of the vagina, uterus, or rectum reflect different anatomical relationships and clinical implications. Recognizing these distinctions is vital for accurate diagnosis and treatment.