Is there any error in B-ultrasound

The accuracy of B-ultrasound examination is still very high, because it can observe the changes in your body very intuitively, which is especially important for women after pregnancy. However, this examination is not 100% accurate and there will still be certain errors. Therefore, after discovering abnormal B-ultrasound results, other more comprehensive examination measures need to be taken to confirm the condition.

Is B-ultrasound accurate?

B-ultrasound examination can detect whether there are space-occupying lesions, especially the physical characterization, quantity and volume of effusions and cysts, which are quite accurate. The detection rate of various intraluminal stones is higher than that of traditional examination methods. It has also solved many difficult problems in obstetrics that were difficult to detect in the past. For example, it can locate the placenta, measure amniotic fluid, and make early diagnosis of single or multiple births, fetal development, malformations, and hydatidiform mole.

(1) Gallstones: The diagnostic rate of B-ultrasound for gallstones is over 90%, and stones as small as 3 mm in diameter can be detected. Although the diagnosis rate of bile duct stones is not as high as that of gallbladder stones due to the interference of intestinal gas, changes such as bile duct dilatation and thickening of the bile duct wall caused by bile duct stones can be seen.

(2) Cholecystitis: Cholecystitis can cause changes in the size and wall of the gallbladder. In acute cholecystitis, B-ultrasound may show enlarged gallbladder and diffuse thickening of the cyst wall; in chronic cholecystitis, the gallbladder may swell or shrink, with thickened walls and rough edges.

(3) Biliary tract tumors: The ultrasound image of benign gallbladder tumors appears as a semicircular or nearly circular, bright mass with uniform structure; the mass of malignant tumors is irregular in shape, uneven in density, and the gallbladder wall is thickened and uneven; the sonogram of cholangiocarcinoma appears as an irregular mass in the middle of the bile duct, and the bile duct above the mass is often dilated and thickened.

(4) Biliary ascariasis: Ultrasound images show strips of ascariasis light parallel to the bile duct, and even the peristalsis of the ascariasis can be seen.

(5) Obstructive jaundice: The normal inner diameter of the extrahepatic bile duct is generally less than 6 mm, and the inner diameter of the left and right hepatic ducts is less than 2 mm. If the B-ultrasound shows a value greater than the above, it indicates that the bile duct is blocked, and the bile duct above the obstruction appears dilated and thickened. Therefore, the site of the obstruction can be determined, and sometimes the cause of the obstruction can also be provided.