Added value of ancillary imaging features for differentiating scirrhous hepatocellular carcinoma from intrahepatic cholangiocarcinoma on gadoxetic acid-enhanced MR imaging

• Published in: European radiology Vol. 28; no. 6; pp. 2549 - 2560
• Main Authors: Choi, Seo-Youn, Kim, Young Kon, Min, Ji Hye, Kang, Tae Wook, Jeong, Woo Kyoung, Ahn, Soohyun, Won, Hojeong
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2018; Springer Nature B.V
• Subjects: Acids; Adult; Aged; Bile Duct Neoplasms - pathology; Bile Ducts, Intrahepatic - pathology; Carcinoma, Hepatocellular - pathology; Cell Differentiation; Cholangiocarcinoma; Cholangiocarcinoma - pathology; Contrast Media; Darkness; Diagnosis; Diagnosis, Differential; Diagnostic Radiology; Diagnostic systems; Differentiation; Equipment acquisition planning; Female; Gadolinium DTPA; Gastrointestinal; Hepatocellular carcinoma; Humans; Imaging; Internal Medicine; Interventional Radiology; Liver cancer; Liver Neoplasms - pathology; Magnetic resonance imaging; Magnetic Resonance Imaging - methods; Male; Medicine; Medicine & Public Health; Middle Aged; Neuroradiology; Patients; Radiology; Retrospective Studies; Sensitivity; Sensitivity and Specificity; Septum; Surgery; Tumors; Ultrasound; Carcinoma, hepatocellular; Bile duct neoplasm; Magnetic resonance imaging; Liver neoplasms; Cholangiocarcinoma
• ISSN: 0938-7994; 1432-1084
• DOI: 10.1007/s00330-017-5196-y

Objectives To determine ancillary features that help distinguish between scirrhous hepatocellular carcinoma (S-HCC) and intrahepatic cholangiocarcinoma (ICC) and investigate added value of ancillary features to enhancement pattern-based diagnosis on gadoxetic acid-enhanced MRI. Methods This retrospective study included 96 patients with S-HCCs and 120 patients with ICCs who underwent gadoxetic acid MRI before surgical resection. Two observers reviewed MRIs of the tumours. After determining ancillary features for differentiating tumour types, we measured the diagnostic performance of adding ancillary features to enhancement pattern-based diagnosis. Results T2 central darkness, capsule and septum were significant and independent features differentiating S-HCC from ICC (p ≤ .06). Adding ancillary features to enhancement pattern led to increased accuracy (observer 1, 78.9 vs. 93.8 %; observer 2, 80.3 vs. 92.8 %; p < .001), sensitivity (observer 1, 74.5 vs. 96.4 %; observer 2, 77.1 vs. 93.2 %; p < .001 and .001), and specificity (observer 1, 82.5 vs. 91.7 %; observer 2, 82.9 vs. 92.5 %; p = .006 and .005) for diagnosis of S-HCC by differentiation from ICC. Conclusions Adding ancillary features capsule, septum and T2 central darkness to conventional enhancement patterns on gadoxetic acid-enhanced MRI improved accuracy, sensitivity and specificity for S-HCC diagnosis with differentiation from ICC. Key Points • Capsule, septum, and T2 central darkness were ancillary features for S-HCC. • A typical HCC enhancement was seen in 31.3% of S-HCCs. • Ancillary MRI features were useful in differentiation between S-HCC and ICC.