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Fig. 5 —Comparison of cumulative attenuation conversion rates for 57 hypoattenuating lesions (three lesions that regressed spontaneously were excluded). Group A = unchanged attenuation (n = 21), Group B1 = hyper-in-hypoattenuating type (n = 25), Group B2 = entirely hyperattenuating type (n = 11), Group B3 = Group B1 lesions with additional follow-up (n = 6). Cumulative attenuation conversion rates of groups A, B1, and B2 were 0, 24.0%, and 27.3% at 1 year; 0, 60.0%, and 72.7% at 2 years; and 0, 80.0%, and 91.0% at 3 years. Cumulative attenuation conversion rate from hyper-in-hypoattenuating to entirely hyperattenuating type (group B3) was 83.3% at 1 year. Statistically significant difference was seen between groups B3 and B1 and between groups B3 and B2 (p < 0.001). No significant difference was seen between groups B1 and B2.