Dennis Lee, MD
Dennis Lee, MD
Dr. Lee was born in Shanghai, China, and received his college and medical training in the United States. He is fluent in English and three Chinese dialects. He graduated with chemistry departmental honors from Harvey Mudd College. He was appointed president of AOA society at UCLA School of Medicine. He underwent internal medicine residency and gastroenterology fellowship training at Cedars Sinai Medical Center.
In this Article
What are the potential pitfalls of diagnosing gallstones?
Usually, it is not difficult to diagnose gallstones. Problems arise, however, because of the high prevalence of silent gallstones and the occasional gallstone that is difficult to diagnose.
If a patient has symptoms that are typical for gallstones, for example, biliary colic, cholecystitis, or pancreatitis, and has gallstones on ultrasonography, little else usually needs to be done to demonstrate that the gallstones are causing the symptoms unless the patient has other complicating medical issues.
If symptoms are not typical for gallstones there is a possibility that the gallstones are innocent bystanders, and most importantly, removing the gallbladder surgically will not treat the acute problem or prevent further episodes. In addition, the real cause of the problem will not be pursued. In such a situation, there is a need to obtain further evidence, other than their mere presence, that the gallstones are causing the problem. Such evidence can be obtained during an episode or shortly thereafter.
If ultrasonography can be done during an episode of pain or inflammation caused by gallstones, it may be possible to demonstrate an enlarged gallbladder or bile duct caused by obstruction of the ducts by the gallstone. This is likely to require ultrasonography again after the episode has resolved in order to demonstrate that the gallbladder indeed was larger during the episode than before or after the episode. It is easier to obtain the necessary ultrasonography if the episode lasts several hours, but it is much more difficult to obtain ultrasonography rapidly enough if the episode lasts only 15 minutes.
Another approach is to test the blood for abnormal liver and pancreatic enzymes. The advantage here is that the enzymes, though not always elevated, can be elevated during an acute attack and for several hours after an episode of gallstone-related pain or inflammation, so they may be abnormal even after the episode has subsided. It is important to remember, however, that the enzymes are not specific for gallstones, and it is necessary to exclude other liver and pancreatic causes for abnormal enzymes.
Sometimes, episodes of pain or inflammation may be more or less typical of gallstones, but transabdominal ultrasonography may not demonstrate either gallstones or another cause of the episodes. In this situation, it is necessary to decide whether suspicion is high or low for gallstones as a cause of the episodes. If suspicion is low because of less typical symptoms, it may be reasonable only to repeat the ultrasonography, obtain an OCG, and/or test for abnormalities of liver or pancreatic enzymes. If suspicion is high because of more typical symptoms, it is reasonable to go even further with endoscopic ultrasonography, ERCP, and duodenal drainage. Prior to these "invasive" procedures, some physicians recommend MRCP; however, the exact role of MRCP is not yet clear.
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