Endoscopic Ultrasound (EUS)
Ultrasonography is a modality frequently utilized in clinical practice, particularly for the diagnosis of digestive system disorders. While it shares imaging characteristics with conventional X-rays, it does not involve radiation.
Because EUS visualizes the individual structural walls and layers of the gastrointestinal tract in high definition, it is heavily utilized in the staging of tumors (assessing tumor size, depth of invasion, lymph node involvement, and adjacent organ metastasis) arising within or adjacent to the digestive system. It is also used to evaluate subepithelial lesions (lesions located beneath the mucosal lining of the gastrointestinal tract).
Tissue Sampling and Interventional Capabilities
This modality is exceptionally useful—and in certain clinical scenarios, far superior to other advanced imaging methods—for evaluating the esophagus, stomach, pancreas, and biliary tree.
Through EUS, tissue samples (biopsies) can be obtained directly from tumors originating within the digestive tract or adjacent organs. Furthermore, fluid collections such as cysts can be therapeutic drained, a field known as Interventional EUS.
How is EUS Performed?
The EUS procedure is performed by integrating a miniaturized ultrasonography transducer—which emits and records high-frequency acoustic waves—directly onto the distal tip of a specialized flexible endoscope.
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