Hypervascular Liver Lesions on MRI

Utility of volumetric contrast‐enhanced and diffusion‐weighted MRI in differentiating between common primary hypervascular liver tumors

“…Hypervascular liver tumors such as HCC, FNH, and HCA are commonly encountered in clinical practice. Patients with FNH and HCA, in particular, are usually from populations with similar demographics . MRI characteristics may sometimes overlap between the two groups, as well as in patients with HCC, making an accurate diagnosis difficult .…”

“…Imaging characteristics of FNH were: an isointense lesion with a hypointense central scar on T 1 ‐weighted images, an isointense‐hyperintense lesion with a hyperintense central scar on T 2 ‐weighted images, and a homogeneous enhancement during the arterial phase that becomes isointense in the portal venous phase. The central scar was hypoenhancing on early postcontrast images, and hyperenhancing on delayed images …”

“…The remaining lesions were diagnosed based on typical MRI features with follow‐up examinations in the setting of cirrhosis or chronic hepatitis, and elevated alpha‐fetoprotein (AFP) levels (>400). Imaging characteristics of HCC were: visualization of an isointense‐hyperintense lesion on T 1 ‐weighted images, hyperintense lesion on T 2 ‐weighted images, an intense arterial enhancement followed by “rapid washout” in venous‐delayed phases, and a persistent rim enhancement (capsule) …”

“…A subanalysis was performed comparing the enhancement and ADC values among these pathological HCA subtypes. The MRI criteria that were used to diagnose HCA cases included: hyperintense foci on both unenhanced T 1 ‐weighted and T 2 ‐weighted images, intralesional fat on fat‐suppressed or opposed‐phase T 1 ‐weighted images, and heterogeneous hypervascularity in the arterial phase with no washout in the subsequent phases …”

Radiologische Diagnostik primärer Lebermalignome

“…2). Als typisches Merkmal weist das HCC in der Kontrastmittel-Dynamik meist eine starke KMAnreicherung in der arteriellen Phase mit rascher Auswaschung auf [51,52]. Bei größeren Läsionen findet sich auch häufig eine eher unspezifische Kontrastmittelaufnahme, kleine Läsionen haben meist ein eher homogenes Enhancement.…”