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From the RSNA Refresher Courses

Focused Abdominal US for Trauma¹

¹ From the Department of Radiology (J.P.M.) and Division of Emergency Medicine (J.R.R.), University of California–Davis Medical Center, 4860 Y St, Ste 3100, Sacramento, CA 95817; and General Hospital of Chinese PLA, Beijing, China (L.W.). Presented as a refresher course at the 2000 RSNA scientific assembly. Received February 13, 2001; revision requested March 28 and received April 16; accepted May 16. Address correspondence to J.P.M.

Focused abdominal ultrasonography (US) has been introduced in Europe as a method to evaluate blunt abdominal trauma. The main focus of the examination is detection of free fluid in the abdomen secondary to injury of the abdominal organs. The examination takes only a few minutes to perform. In the authors’ experience, trauma patients in unstable condition and in whom significant free fluid is detected are immediately taken to the operating room for surgical exploration without undergoing computed tomographic (CT) correlation. The authors have also used US to identify the specific site of organ injury. Injuries to solid organs such as the liver, spleen, and kidney that are identified with US usually appear heterogeneous or hyperechoic. A hematoma surrounding the injured organ may appear echogenic or hypoechoic. However, pitfalls of focused abdominal US for trauma include failure to show contained solid-organ injuries; injuries to the diaphragm, pancreas, and adrenal gland; and some bowel injuries. Thus, negative findings at US do not exclude an intraperitoneal injury, and close clinical observation or CT is warranted.

Index Terms: Abdomen, injuries, 70.41, 80.41 • Abdomen, US, 70.12981, 80.12981 • Trauma, 70.41, 80.41

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