Benign focal liver lesions: The role of magnetic resonance imaging

Figure 2 A 53-year-old patient presented with right hypochondrium pain and underwent abdominal ultrasound examination demonstrating a hyperechoic nodule in S4. Liver magnetic resonance imaging confirmed an isointense nodule on T1 in-phase sequence with loss of signal on opposed-phase T1-weighted images, isointense on T2 sequences, without increased signal intensity on diffusion weighted images, with minimum wash-in on the arterial phase and wash-out on the portal-venous and delayed phase, hypointense in the hepatobiliary phase, findings consistent with hepatocyte nuclear factor 1α - mutated hepatocellular adenoma. A: In-phase T1-weighted image; B: Out-of-phase T1-weighted image; C: T2-weighted image; D: T2-Spectral Attenuated Inversion Recovery; E: High b-value diffusion weighted imaging; F: Arterial phase magnetic resonance imaging (MRI); G: Portal venous phase MRI; H: Delayed phase MRI; I-L: Hepatobiliary phase MRI.