By Guy Marchal MD (auth.), Andreas Heuck MD, Maximilian Reiser MD (eds.)
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Radiology 180:25-30 Matsui 0, Kadoya M, Kameyama T, et al. (1989) Adenomatous hyperplastic nodules in the cirrhotic liver: differentiation from hepatocellular carcinoma with MR imaging. Radiology 173:123-126 Mattison GR, Glazer GM, Quint LE, Francis IR, Bree RL, Ensminger WB (1987) MR imaging of hepatic focal nodular hyperplasia: characterization and distinction from primary malignant hepatic tumors. AJR 148:711-715 McFarland EG, Mayo-Smith WW, Saini S, Hahn PF, Goldberg MA, Lee MJ (1994) Hepatic hemangiomas and malignant tumors: improved differentiation with heavily T2weighted conventional spin-echo MR imaging.
1991). Similar to CT, on precontrast gradient-echo studies, HCC appears as a hypointense to isointense mass often associated with a circumferential, well-defined circular zone of lower density (capsule) (Fig. 5). On postgadolinium MRI studies, intense, transient heterogeneous enhancement (mosaic pattern) is present. Homogeneous enhancement suggests benign disease unless the lesion is very small (Fig. 8). Extension beyond the liver capsule also may be vis- c Fig. 8. a A Tl-weighted sequence shows an ill-defined area of low signal intensity (arrows).
A Tumor in the left lobe of the liver is slightly hypointense on this Tl-weighted GE scan; note the hypo intense central scar. b The tumor is only slighly hyperintense on the T2-weighted image (TSE 46001 165); note the characteristic hyperintense appearance of the tumor scar (arrowhead). c Coronal Tl-weighted FLASH image of the same tumor Radiographic differentiation of FNH from other primary or secondary hepatic lesions may be difficult (TITELBAUM et al. 1988; WILBUR and GYI 1987; HAMRICK-TuRNER et al.
Abdominal and Pelvic MRI by Guy Marchal MD (auth.), Andreas Heuck MD, Maximilian Reiser MD (eds.)