This technique involves the use of fluid to distend the uterus (womb) coupled with high-resolution transvaginal (internal) scan. A standard speculum is inserted into the vagina and a fine catheter (tube) is gently fed through the neck of the womb and placed into the uterine cavity. The speculum is then removed, an ultrasound internal probe inserted and fluid injected into the womb under direct ultrasound observation.
SIS allows tremendous diagnostic enhancement with a relatively simple and well-tolerated outpatient procedure. It is easily and rapidly performed in the overwhelming majority of patients and virtually devoid of complications.
SIS provides a degree of image magnification similar to performing ultrasound through a microscope. Structures that would not be appreciated with the naked eye can easily be identified through enhanced ultrasonography performed by a trained operator.
Assessment of the endometrial cavity and thickness is very accurate. The need for invasive procedures such as biopsy (taking a sample of tissue), hysteroscopy (inserting a telescope into the uterus through the neck of the womb) and dilatation & curettage is greatly reduced in women with abnormal bleeding. SIS can be used as an investigation of infertility and recurrent miscarriage, and to further study the presence of a mass (fibroid or polyp) in the uterine cavity.
The report of the scan highlighting the findings is available straightaway and will be sent to the referring doctor and a copy to the patient.