Benign focal liver lesions: The role of magnetic resonance imaging

Figure 4 A 41-year-old female presented to the emergency department with diffuse abdominal pain and underwent ultrasound examination revealing a 5. 3 cm solid hypoechoic lesion in S7. Liver magnetic resonance imaging confirmed an isointense lesion on T1-weighted sequence, isointense in T2 sequences, with minimum increased signal intensity on diffusion weighted images and isointense on the ADC map. After gadoxetic acid administration the lesion shows intense arterial enhancement; slightly hyperintense on the portal venous and delayed phases. The mass shows hyperintense signal on the hepatobiliary phase. These findings are consistent with typical focal nodular hyperplasia. A: Liver ultrasound image; B: In-phase T1-weighted image; C: Out-of-phase T1-weighted image; D: T2-weighted image; E: T2-Spectral Attenuated Inversion Recovery; F: High b-value diffusion weighted imaging; G: ADC map; H: Liver ultrasound image; I: Pre-contrast phase magnetic resonance imaging (MRI); J: Arterial phase MRI; K: Portal venous phase MRI; L: Delayed phase MRI; M and N: Hepatobiliary phase MRI.