Interventional radiology is the diagnosis and treatment of conditions using minimally invasive techniques with image guidance. Interventional radiologists (board-certified physicians with additional advanced training in image-guided, minimally invasive techniques) insert small instruments, such as catheters, or fine needles through small incisions, guiding them thorough the body with the aid of various imaging techniques—for example, computed tomography (CT), ultrasound or X-ray—rather than by direct visualization.
Interventional radiology offers a "minimally invasive" alternative to surgery, and can eliminate the need for hospitalization. In some cases, patients can be diagnosed and then treated during the same procedure.