REFERENCES
1. Tanaka S, Kitamura T, Fujita M, Nakanishi K, Okuda S. Color Doppler flow imaging of liver tumors. AJR Am J Roentgenol 1990;154:509-14.
2. Lencioni R, Pinto F, Armillotta N, Bartolozzi C. Assessment of tumor vascularity in hepatocellular carcinoma: comparison of power Doppler US and color Doppler US. Radiology 1996;201:353-8.
3. Winter TC 3rd, Takayasu K, Muramatsu Y, Furukawa H, Wakao F, Koga H, Sakamoto M, Hirohashi S, Freeny PC. Early advanced hepatocellular carcinoma: evaluation of CT and MR appearance with pathologic correlation. Radiology 1994;192:379-87.
4. Takayasu K, Muramatsu Y, Furukawa H, Wakao F, Moriyama N, Takayama T, Yamasaki S, Sakamoto M, Hirohashi S. Early hepatocellular carcinoma appearance at CT during arterial portography and CT arteriography with pathologic correlation. Radiology 1995;194:101-5.
5. Hayashi M, Matsui O, Ueda K, Kawamori Y, Kadoya M, Yoshikawa J, Gabata T, Takashima T, Nonomura A, Nakanuma Y. Correlation between the blood supply and grade of malignancy of hepatocellular nodules associated with liver cirrosi: evaluation by CT during intrarterial injection of contrast medium. AJR Am J Roentgenol 1999;172:969-76.
6. Stark DD, Weissleder R, Elizondo G, Hahn PF, Saini S, Todd LE, Wittenberg J, Ferrucci JT. Superparamagnetic iron oxide: clinical application as a contrast agent for MR imaging of the liver. Radiology 1998;168:297-301.
7. Imai Y, Murakami T, Yoshida S, Nishikawa M, Ohsawa M, Tokunaga K, Murata M, Shibata K, Zushi S, Kurokawa M, Yonezawa T, Kawata S, Takamura M, Nagano H, Sakon M, Monden M, Wakasa K, Nakamura H. Superparamagnetic iron oxide-enhanced magnetic resonance imaging oh hepatocellular carcinoma: correlation with histological grading. Hepatology 2000;32:205-12.
8. Fujimoto M, Moriyasu F, Nishikawa K, Nada T, Okuma M. Color Doppler sonography of hepatic tumors with a galactose-based contrast agent: correlation with angiographic findings. AJR Am J Roentgenol 1994;163:1099-104.
9. Choi BI, Kim TK, Han JK, Kim AY, Seong CK, Park SJ. Vascularity of hepatocellular carcinoma: assessment with contrast-enhanced second-harmonic versus conventional power Doppler US. Radiology 2000;214:381-6.
10. Lencioni R, Cioni D, Bartolozzi C. Tissue harmonic and contrast-specific imaging: back to gray scale in ultrasound. Eur Radiol 2002;12:151-65.
11. Hirai T, Ohishi H, Tokuno E, Takahashi M, Sakaguchi H, Anai H, Nishimoto Y, Hirohashi S, Kichikawa K. Qualitative diagnosis of hepatocellular carcinoma by contrast-enhanced ultrasonography using coded harmonic angio with Levovist. J Med Ultrason 2002;29:3-9.
12. Koda M, Matsunaga Y, Ueki M. Qualitative assessment of tumor vascularity in hepatocellular carcinoma by contrast-enhanced coded ultrasound: comparison with arterial phase of dynamic CT and conventional color/power Doppler ultrasound. Eur Radiol 2004;14:1100-8.
13. Dill-Macky MJ, Burns PN, Khalili K, Wilson SR. Focal hepatic masses: enhancement patterns with SH U 508A and pulse-inversion US. Radiology 2002;222:95-102.
14. Nicolau C, Brú C. Focal liver lesions: evaluation with contrast enhanced ultrasonography. Abdom Imaging 2004;29:348-59.
15. Quaia E, Calliada F, Bertolotto M, Rossi S, Garioni L, Rosa L, Pozzi-Mucelli R. Characterization of focal liver lesions with contrast-specific US modes and a sulfur hexafluoride-filled microbubble contrast agent: diagnostic performance and confidence. Radiology 2004;232:420-30.
16. Gaiani S, Celli N, Piscaglia F, Cecilioni L, Losinno F, Giangregorio F, Mancini M, Pini P, Fornari F, Bolondi L. Usefulness of contrast-enhanced perfusionale sonography in the assessment of hepatocellular carcinoma hypervascular at spiral computed tomography. J Hepatol 2004;41:421-6.
17. Xu HX, Liu GJ, Lu MD, Xie XY, Xu ZF, Zheng YL, Liang JY. Characterization of focal liver lesions using contrast-enhanced sonography with a low mechanical index mode and a sulfur hexafluoride-filled microbubble contrast agent. J Clin Ultrasound 2006;34:261-72.
18. Liu GJ, Xu HX, Lu MD, Xie XY, Xu ZF, Zheng YL, Liang JY. Enhancement pattern of hepatocellular carcinoma: comparison of real-time contrast-enhanced ultrasound and contrast-enhanced computed tomography. Clin Imaging 2006;30:315-21.
19. Xu HX, Xie XY, Lu MD, Liu GJ, Xu ZF, Zheng YL, Liang JY, Chen LD. Contrast-enhanced sonography in the diagnosis of small hepatocellular carcinoma. J Clin Ultrasound 2006;36:257-66.
20. Giorgio A, Ferraioli G, Tarantino L, de Stefano G, Scala V, Scarano F, Coppola C, Del Viscovo L. Contrast-enhanced sonographic appearance of hepatocellular carcinoma in patients with cirrhosis: comparison with contrast-enhanced helical CT appearance. AJR Am J Roentgenol 2004;183:1319-26.
21. Quaia E, Bertolotto M, Dalla Palma L. Characterization of liver hemangiomas with pulse-inversion harmonic imaging. Eur Radiol 2002;12:537-44.
22. Bruix J, Sherman M, Committee Practice Guidelines, Diseases American Association for the Study of Liver. Mangement of heptocellular carcinoma. Hepatology 2005;42:1208-36.
23. Strobel D, Seitz K, Blank W, Schuler A, Dietrich C, von Herbay A, Friedrich-Rust M, Kunze G, Becker D, Will U, Kratzer W, Albert FW, Pachmann C, Dirks K, Strunk H, Greis C, Bernatik T. Contrast-enhanced ultrasound for the characterization of focal liver lesions--diagnostic accuracy in clinical practice (DEGUM multicenter trial). Ultraschall Med 2008;29:499-505.
24. Strobel D, Seitz K, Blank W, Schuler A, Dietrich CF, von Herbay A, Friedrich-Rust M, Bernatik T. Tumor-specific vascularization pattern of liver metastasis, hepatocellular carcinoma, hemangioma and focal nodular hyperplasia in the differential diagnosis of 1,349 liver lesions in contrast-enhanced ultrasound (CEUS). Ultraschall Med 2009;30:376-82.
25. Seitz K, Strobel D, Bernatik T, Blank W, Friedrich-Rust M, Av Herbay, Dietrich CF, Strunk H, Kratzer W, Schuler A. Contrast-Enhanced Ultrasound (CEUS) for the characterization of focal liver lesions - prospective comparison in clinical practice: CEUS vs. CT (DEGUM multicenter trial). Parts of this manuscript were presented at the Ultrasound Dreiländertreffen 2008, Davvos. Ultraschall Med 2009;30:383-9.
26. Seitz K, Bernatik T, Strobel D, Blank W, Friedrich-Rust M, Strunk H, Greis C, Kratzer W, Schuler A. Contrast-enhanced ultrasound (CEUS) for the characterization of focal liver lesions in clinical practice (DEGUM Multicenter Trial): CEUS vs. MRI--a prospective comparison in 269 patients. Ultraschall Med 2010;31:492-9.
27. Catalano O, Nunziata A, Lobianco R, Siani A. Real-time harmonic contrast material-specific US of focal liver lesions. Radiographics 2005;25:333-49.
28. Loria F, Loria G, Basile S, Crea G, Frosina L, Di Carlo I. Contrast-enhanced ultrasound appearance of enhancement patterns of intrahepatic cholangiocarcinoma: correlation with pathological findings. Updates Surg 2014;66:135-43.
29. Toro A, Mahfouz AE, Ardiri A, Malaguarnera M, Malaguarnera G, Loria F, Bertino G, Di Carlo I. What is changing in indications and treatment of hepatic hemangiomas. A review. Ann Hepatol 2014;13:327-39.
30. Von herbay A, Westendorff J, Gregor M. Contrast-enhanced ultrasound with sonovue: differentiation between benign and malignant focal liver lesions in 317 patients. J Clin Ultrasound 2010;38:1-9.
31. Sirli R, Sporea I, Martie A, Popescu A, Dănilă M. Contrast-enhanced ultrasound in focal liver lesions- a cost efficiency study. Med Ultrason 2010;12:280-5.
32. Bryant TH, Blomley MJ, Albrecht T, Sidhu PS, Leen EL, Basilico R, Pilcher JM, Bushby LH, Hoffmann CW, Harvey CJ, Lynch M, MacQuarrie J, Paul D, Cosgrove DO. Improved characterization of liver lesions with liver-phase uptake of liver specific microbubbles: prospective multi center trial. Radiology 2004;232:799-809.
33. Loria F, Loria G, Basile S, Crea G, Randazzo D, Frosina L. Contrast-enhanced ultrasound of hepatocellular carcinoma: correlation between enhancement pattern and cellular differentiation on histopatology. Updates Surg 2012;64:247-55.
34. Galassi M, Iavarone M, Rossi S, Bota S, Vavassori S, Rosa L, Leoni S, Venerandi L, Marinelli S, Sangiovanni A, Veronese L, Fraquelli M, Granito A, Golfieri R, Colombo M, Bolondi L, Piscaglia F. Patterns of appearance and risk of misdiagnosis of intrahepatic cholangiocarcinoma in cirrosi at contrast enhanced ultrasound. Liver Int 2013;33:771-9.