Diagnostic Accuracy of Ultrasonography-guided Needle Biopsy of the Liver as determined by Postsurgical Sampling

Lee, Young Doo; Jeon, Seong Woo; Lee, Seung Yup; Park, Jae Hong; Ha, Seung Soo; Kim, Dae Hyun; Tak, Won Young; Kwon, Young Oh; Kim, Sung Kuk; Choi, Yong Hwan; Chung, Joon Mo; Kim, Dong Ja

Abstract

BACKGROUND/AIMS: It is questionable whether the needle biopsy of the liver can represent the whole pathology of the liver. This study evaluates the diagnostic accuracy of ultrasonography-guided needle biopsy of the liver as determined by surgically resected liver. METHOD: The histopathologic findings of preoperative ultrasonography-guided needle biopsy for confirming the background liver disease and surgically resected liver were compared in the 40 patients with primary hepatocellular carcinoma.
RESULTS
1) Of the 40 cases, 30 (75.0%) cases showed the same histopathological diagnosis between the two methods. Their histopathological results were: 20 cases of cirhosis, 6 cases of chronic hepatitis and 4 cases of normal tissue. 2) There was a direct proportion between histologic concordance, the number of portal areas, and the size of the needle biopsy specimen. The histologic concordance rate was 79.2% in the cases with 4 portal areas in their biopsy sample and 100% in the cases with more than 5 areas. 3) Of the 10 cases in which diagnostic discrepancy was found between the two methods, 8 cases of chronic hepatitis and 1 case of normal tissue, all diagnosed by needle biopsy, proved to be cirrhosis by surgically resected liver. One case of normal tissue proved to be chronic hepatitis. The causes of diagnostic error were fragmentations of tissue and inadequate specimens.
CONCLUSION
The diagnostic accuracy of the ultrasonography-guided needle biopsy of the liver was 75.0% in our study. To lessen the diagnostic error, at least 4 or more portal areas should be contained in the biopsy sample and the fragmentation of tissue should be minimized.