Chapter 251 Transvaginal Ultrasonography
DESCRIPTION
Transvaginal ultrasonography is a technique of ultrasonographic visualization of the uterus and adnexa using an ultrasonography probe placed in the vaginal canal.
INDICATIONS
Any situation in which imaging of the pelvic organs is appropriate and greater resolution than that which is possible with transabdominal approaches is desirable. (The resolution of transvaginal ultrasonography derives from the proximity of the ultrasound transducer and the higher frequencies of sound waves used by these devices. In some cases, this resolution may be as small as 0.2 mm.) Typical gynecologic indications include uterine size, shape, and orientation; evaluation of endometrium, myometrium, and cervix; identification and morphology of ovaries, assessment of the uterus and adnexa for masses, cysts, hydrosalpinges, and fluid collections; and evaluation of the cul-de-sac for free fluid or masses. Common obstetric indications include the assessment of cervical length, placental location, or the evaluation of fetal parts low in the pelvis.

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