ABSTRACT
Anatomically, the pelvis can be divided into the greater and lesser pelvis by an oblique line which passes through the prominence of the sacrum to the superior margin of the pubic symphysis. By distension of the urinary bladder, gas-filled bowel loops are displaced from the lesser pelvis, permitting the visualization of the genital organs and anatomical structures within the lesser pelvis. The vagina is an easily accessible organ by pelvic examination, but ultrasound has proven to be very helpful in the initial evaluation of patients with vaginal masses, particularly in prepubertal girls. Successful ultrasound diagnosis of Gartner duct cysts, hemato- and mucocolpos, urine reflux, and solid masses have been reported. Accurate ultrasound diagnosis of fusion anomalies in a pregnant patient during the first trimester and the first half of the second trimester usually poses no difficulties and has been extensively reported. The ultrasonic diagnosis of pelvic inflammatory disease is not specific, but it can be useful together with other information.
