Diagnostic ultrasound is a powerful medical tool that uses high-frequency sound waves to create real-time images of structures inside the body [5]. Unlike X-rays or CT scans, it does not use radiation, making it a safe option for many patients, including children and pregnant individuals [2, 5]. For abdominal imaging, a transducer is moved over the skin, sending sound waves into the body and detecting the echoes that bounce back from organs and tissues. These echoes are then converted into images on a screen [5]. This non-invasive, painless, and relatively easy-to-use method provides valuable information about the size, shape, and structure of organs, as well as the presence of abnormal fluid collections or other issues [2].
Investigating Abdominal Pain and Emergencies
Abdominal pain is a common reason for seeking medical attention, and ultrasound can be a crucial first step in diagnosis. For instance, sudden onset pain in the upper abdomen, particularly the right upper quadrant, might raise concerns for conditions like acute cholecystitis (gallbladder inflammation) or a perforated gastric ulcer [1]. In such emergency situations, a point-of-care ultrasound (POCUS) of the right upper quadrant can rapidly assess for signs of free air within the abdominal cavity, a condition known as pneumoperitoneum [1]. This finding, often indicated by specific ultrasound signs like an "enhanced peritoneal stripe sign," reverberation, and ring-down artifacts, suggests a rupture of a hollow organ and requires immediate medical attention [1]. While a formal ultrasound might sometimes miss subtle signs, POCUS can be highly sensitive in detecting this critical condition [1].
Diagnosing Gastrointestinal Issues
Ultrasound plays a significant role in evaluating various gastrointestinal conditions. For children experiencing digestive tract symptoms, gastrointestinal contrast-enhanced ultrasonography (CEUS) offers a non-invasive alternative to gastroscopy, which is the gold standard but an invasive procedure, for diagnosing peptic ulcers [2]. Routine ultrasound can reveal important details such as the thickness of the gastroduodenal wall, gastric peristalsis (the wave-like contractions that move food through the digestive tract), and the condition of surrounding organs [2]. CEUS further enhances the diagnostic capabilities by tracking contrast agents, providing more detailed information about blood flow and tissue characteristics [2].
Beyond ulcers, ultrasound is also valuable in diagnosing and monitoring chronic inflammatory bowel diseases (IBD), particularly in Europe [8]. IBD often affects young patients who require repeated imaging over time to monitor disease activity and treatment response [8]. Ultrasound can assess mucosal alterations, transmural involvement (how deeply the inflammation penetrates the bowel wall), and extraintestinal manifestations (problems outside the digestive tract) [8]. Its non-radioactive nature makes it a preferred choice for these patients compared to CT scans, which involve radiation exposure [8].
Identifying Internal Collections
In some cases, abdominal pain or systemic symptoms like fever can indicate an internal collection of fluid, such as an infected intra-abdominal hematoma [6]. While often presenting with non-specific features, imaging techniques are essential for diagnosis [6]. For example, following bariatric surgery, a rare but serious complication can be an infected hematoma near the stomach, which can be identified through imaging and may require drainage and antibiotics [6]. Although CT-guided drainage is mentioned in one case, ultrasound can often initially detect such collections, guiding further diagnostic or interventional steps.
Ultrasound in Gynecologic and Obstetric Care
Ultrasound is an indispensable tool in women's health, with extensive applications in both obstetrics and gynecology [5]. For women presenting with pelvic complaints in the emergency department, point-of-care ultrasound, using both transabdominal (over the abdomen) and transvaginal (internal) approaches, can effectively assess a wide range of obstetric or gynecologic pathologies [7]. This includes evaluating pregnancies, assessing reproductive organs, and identifying conditions like ovarian cysts, fibroids, or ectopic pregnancies [5, 7]. Despite its numerous benefits, it's important to recognize that like any diagnostic tool, ultrasound has potential pitfalls, and guidelines are in place to ensure its safe and effective use [5].
Why Ultrasound Matters
Abdominal ultrasound stands out as a versatile and patient-friendly diagnostic method. Its advantages include being non-invasive, painless, non-radioactive, and relatively quick to perform [2]. It provides real-time images, allowing clinicians to observe organ function and blood flow [5]. While it may not be the sole diagnostic tool for every condition, it often serves as an excellent initial imaging modality or a complementary test to others like CT or MRI [2, 8]. Its ability to provide rapid insights into a patient's condition, especially in emergency settings or for chronic monitoring, underscores its critical role in modern medicine [1, 8].
Sources
1. A-Lines below the Diaphragm - A Case Report of Occult Pneumoperitoneum. (Journal of education & teaching in emergency medicine, 2026) https://pubmed.ncbi.nlm.nih.gov/42559542/
2. Gastrointestinal contrast-enhanced ultrasonography for diagnosis and treatment of peptic ulcer in children. (World journal of gastroenterology, 2024) https://pubmed.ncbi.nlm.nih.gov/38515948/
3. Computed tomography findings of acute gastric peptic ulcer. (Clinical imaging, 2021) https://pubmed.ncbi.nlm.nih.gov/33181480/
4. Tuberculosis on two fronts: A case report of liver and stomach involvement in a patient. (IDCases, 2026) https://pubmed.ncbi.nlm.nih.gov/41939005/
5. Benefits and Pitfalls of Ultrasound in Obstetrics and Gynecology. (Obstetrics and gynecology clinics of North America, 2019) https://pubmed.ncbi.nlm.nih.gov/31056137/
6. Infected intra-abdominal hematoma post-laparoscopic one-anastomosis mini gastric bypass: case report and literature review. (International journal of surgery case reports, 2026) https://pubmed.ncbi.nlm.nih.gov/42578201/
7. Clinical Ultrasound in Obstetrics and Gynecology. (Emergency medicine clinics of North America, 2024) https://pubmed.ncbi.nlm.nih.gov/39326991/
8. Diagnostics in inflammatory bowel disease: ultrasound. (World journal of gastroenterology, 2011) https://pubmed.ncbi.nlm.nih.gov/21912467/