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Usefulness of 18F-FDG PET/CT and Multiphase CT in the Differential Diagnosis of Hepatocellular Carcinoma and Combined Hepatocellular Carcinoma-Cholangiocarcinoma

간세포암종과 혼합성 간세포암종-담관암종에서 다위상 전산단층촬영술 소견과 18F-FDG PET/CT에서 섭취율 차이에 대한 분석

  • Jae Chun Park (Department of Radiology, Kosin University Gospel Hospital, Kosin University College of Medicine) ;
  • Jung Gu Park (Department of Radiology, Kosin University Gospel Hospital, Kosin University College of Medicine) ;
  • Gyoo-Sik Jung (Department of Radiology, Kosin University Gospel Hospital, Kosin University College of Medicine) ;
  • Hee Kang (Department of Radiology, Kosin University Gospel Hospital, Kosin University College of Medicine) ;
  • Sungmin Jun (Department of Nuclear Medicine, Kosin University Gospel Hospital, Kosin University College of Medicine)
  • 박재춘 (고신대학교 의과대학 고신대학교 복음병원 영상의학과) ;
  • 박정구 (고신대학교 의과대학 고신대학교 복음병원 영상의학과) ;
  • 정규식 (고신대학교 의과대학 고신대학교 복음병원 영상의학과) ;
  • 강희 (고신대학교 의과대학 고신대학교 복음병원 영상의학과) ;
  • 전성민 (고신대학교 의과대학 고신대학교 복음병원 핵의학과)
  • Received : 2019.08.20
  • Accepted : 2020.01.28
  • Published : 2020.11.01

Abstract

Purpose The purpose of this study was to evaluate the usefulness of multiphasic CT and 18F-fluorodeoxyglucose (FDG) PET/CT for the differentiation of combined hepatocellular carcinoma-cholangiocarcinoma (cHCC-CCA) from hepatocellular carcinoma (HCC). Materials and Methods From January 2007 to April 2016, 93 patients with pathologically confirmed HCC (n = 84) or cHCC-CCA (n = 9) underwent CT and PET/CT imaging. Contrast enhancement patterns were divided into three types based on the attenuation of the surrounding liver parenchyma: type I (early arterial enhancement with delayed washout), type II (early arterial enhancement without delayed washout), and type III (early hypovascular, infiltrative appearance, or peripheral rim enhancement). Results cHCC-CCAs (89%) had a higher PET/CT positive rate than did HCCs (61%), but the PET/CT positive rate did not differ significantly (p = 0.095). Among the 19 cases of the type II enhancement pattern, 3 (21%) of 14 HCCs and 4 (80%) of 5 cHCC-CCAs were PET/CT positive. cHCC-CCAs had a significantly higher PET/CT positive rate (p = 0.020) in the type II enhancement pattern. Conclusion The PET/CT positive rate of cHCC-CCA was significantly higher than that of HCC in lesions with a type II enhancement pattern. The 18F-FDG PET/CT can be useful for the differentiation of cHCC-CCA from HCC in lesions with a type II enhancement pattern on multiphasic CT.

목적 간세포암종과 혼합성 간세포암종-담관암종의 다위상 전산단층촬영술 소견과 18F-fluorodeoxyglucose 양전자방출단층촬영(이하 FDG PET/CT)에서 섭취율 차이를 연구하여 이들의 감별 진단에 유용성이 있는지를 알아보고자 하였다. 대상과 방법 2007년 1월에서 2016년 4월까지 조직학적으로 간세포성 암종으로 진단된 84명과 혼합성 간세포암종-담관암종으로 진단된 9명의 환자를 대상으로 하였다. 조영증강 양상은 유형 I (동맥기 조영증강과 지연기 조영유실), 유형 II (지연기 조영유실이 없는 동맥기 조영증강), 유형 III (저혈관성 병변, 침투성 양상 혹은 변연부 조영증강)로 구분하였고, PET/CT 소견은 FDG 섭취 여부에 따라서 양성과 음성으로 분류하였다. 결과 혼합성 간세포암종-담관암종(89%)은 간세포암종(61%)보다 PET/CT 섭취 양성률이 높았으나 통계적으로 유의한 차이는 보이지 않았다(p = 0.095). 유형 I 조영증강양상을 보이는 58개의 간세포암종 중 37예(64%)가 PET/CT에서 양성이었다. 유형 II 조영증강양상을 보이는 19예 중 간세포암종 3예(21%)에서 PET/CT에서 양성을 보였고 혼합 간세포암종-담관암종 4예(80%)에서 PET/CT 양성을 보였다. 유형 II 조영증강양상을 보이는 경우 혼합 간세포암-담관암종이 간세포암종보다 PET/CT 양성률이 유의하게 높았다(p = 0.020). 유형 III 조영증강 양상을 보이는 16예 중 간세포암 11예(91.6%), 혼합 간세포암-담관암종 4예(100%)에서 PET/CT 양성을 보였다. 유형 III 조영증강양상을 보이는 경우 간세포암과 혼합 간세포암-담관암종의 PET/CT 양성률의 유의한 차이는 보이지 않았다. 결론 유형 II 조영증강 양상을 보이는 경우 간세포암종과 혼합성 간세포암종-담관암종의 감별진단에 전산단층촬영술과 병행하는 18F-FDG PET/CT가 도움이 될 것으로 보인다.

Keywords

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