RESUMO
PURPOSE: The aim of the study was to characterize SonoVue enhancement in hepatocellular carcinoma in correlation to both lesion diameter and histological differentiation of the lesion. MATERIALS AND METHODS: In a prospective study 130 patients (72 male, 58 female, 62 +/- 10 years) with HCC lesions detected by B-mode sonography were examined. After injection of 1.2 - 2.4 ml SonoVue, HCC lesions were examined continuously for up to 5 min using "low MI" sonography. RESULTS: Arterial hypervascularization was found in 72 % of the HCC lesions without correlation to the lesion diameter or histological grading, when analyzed for the total group. However, the analysis of the G 1 subgroup showed significant correlation between lesion diameter and arterial hypervascularization. Arterial hypervascularization was found in 95 % of the G 1 lesions > 3 cm but in only 43 % of the G 1 lesions < 3 cm (p < 0.001). In contrast, analysis of the remaining HCC lesions (without G 1) showed arterial hypervascularization in 69 % of the lesions < 3 cm and in 72 % of the lesions > 3 cm (n. s.) without correlation to the diameter. In the late phase in the G 1 subgroup, hypoechoic demarcation was found in 95 % of the G 1 lesions > 3 cm, but in only 64 % of the G 1 lesions < 3 cm (p < 0.001). In contrast, in the less differentiated HCC lesions (without G 1), hypoechoic demarcation was found in 91 % (HCC > 3 cm) and in 82 % (HCC < 3 cm) of the lesions (n. s.). CONCLUSION: In well-differentiated HCCs (G1) hyperechoic enhancement in the arterial phase and hypoechoic demarcation in the late phase correlate to the diameter.