Role of TVUS in Diagnostic Imaging
Transvaginal and transabdominal ultrasound (Ultrasound, US) are the primary imaging modalities used to begin the evaluation of female pelvic structures. The popularity of the method is due to its multiplanar capability (the ability to display images in multiple planes), widespread equipment availability, and relative affordability.
Unlike other diagnostic imaging methods, TVUS is completely safe because it involves no radiation exposure and does not require contrast agents.
| Imaging modality | Main clinical role |
|---|---|
| US (TVUS) | Primary imaging modality. Evaluation of ovaries, uterus, and guidance of invasive procedures. |
| MRI (MRI) | Modality of choice for Müllerian duct anomalies and indeterminate masses after US. |
| CT (CT) | Backup modality for acute pelvic pain if ultrasound results are equivocal. |
Main clinical indications
The spectrum of conditions for which the method is used is extremely broad. Ultrasound is indicated for:
- Evaluation of pelvic masses: primarily for characterizing ovarian masses.
- Analysis of pathological symptoms: in acute pelvic pain syndrome or postmenopausal bleeding.
- Detection of anatomical changes: for example, uterine enlargement.
- Invasive guidance: visual control during needle biopsy or fluid collection drainage.
Comprehensive scanning (TVUS combined with a transabdominal approach) is also prescribed for all patients with suspected cervical pathologies. The goal of this examination is to establish a preliminary diagnosis and strictly rule out comorbid gynecological conditions.
Diagnosis of Inflammatory Diseases (PID)
Comprehensive ultrasound is a mandatory step for all patients with suspected pelvic inflammatory disease. In this case, scanning serves several purposes simultaneously:
- Verifying the diagnosis and performing differential diagnosis with other acute conditions.
- Detecting concurrent gynecological disorders.
- Searching for tubo-ovarian abscesses — ultrasound has very high diagnostic value for detecting this severe complication.
It is important to remember the key clinical rule: if the ultrasound appearance is completely normal, this does not rule out a diagnosis of PID. To confirm an infectious and inflammatory process, physicians additionally use microscopic examination of vaginal smears.
Sonohysterography: Advanced Capabilities
If routine gynecological ultrasound reveals suspicious lesions in the uterine cavity, the patient may undergo sonohysterography (Sonohysterography).
Procedure technique: The intervention is performed under direct ultrasound guidance. A special balloon catheter (5F size) is inserted through the cervix, after which sterile saline or microbubble contrast medium is slowly instilled into the uterine cavity.
Indications:
- Detailed evaluation of any intrauterine lesions found on the initial scan.
- Evaluation and assessment of fallopian tube patency.
Advantages and risks: The main advantage of sonohysterography over X-ray hysterosalpingography (HSG) is the complete absence of ionizing radiation. In addition, the procedure can be performed in a single visit alongside a routine ultrasound. However, the procedure has strict contraindications (pregnancy, active pelvic infection) and carries complication risks similar to HSG: pain, infection, hemorrhage, and potential vasovagal reactions.
To memorize the indications for pelvic ultrasound, use the mnemonic: Pain (acute pelvic), Masses (ovarian and pelvic), Uterus (enlargement), Biopsy (guidance), Abnormal bleeding (postmenopausal).
Class and exam questions
Can adnexal inflammation be completely ruled out with a normal ultrasound?
No, the absence of visible changes on transvaginal scanning does not completely rule out pelvic inflammatory disease (PID).
What is done if initial ultrasound results in acute pain are equivocal?
In cases of equivocal ultrasound results for diagnosing the causes of acute pelvic pain, computed tomography (CT) may be used.
Which imaging modality should be chosen if ultrasound does not provide a definitive answer regarding the nature of an ovarian tumor?
The modality of choice for further evaluation of indeterminate adnexal masses after initial ultrasound is magnetic resonance imaging (MRI).
How does sonohysterography differ from standard TVUS?
Sonohysterography involves artificial contrast enhancement of the uterine cavity with saline or microbubbles via a catheter. This allows for the most accurate assessment of intrauterine lesions and tubal patency.
What else to study on this topic
- Magnetic Resonance Imaging (MRI) in the Diagnosis of Congenital Müllerian Duct Anomalies
- Embryology and Classification of Combined Developmental Anomalies of the Female Genital Tract and Kidneys
- Hysterosalpingography (HSG): Timing, Indications, and Complication Profile
- Interventional Radiology Techniques: Fallopian Tube Catheterization for Proximal Occlusion
- Comprehensive Laboratory and Pathological Diagnosis of Cervical Pathologies
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