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目的:探讨肝脏局灶性结节增生(FNH)在螺旋CT多期扫描中的表现,以进一步提高CT诊断的准确性.材料与方法:13例经手术证实的FNH,均做平扫、动脉期、门脉期及延迟期扫描.结果:13个病灶平扫低密度者11个,均匀或不均匀,2个为等密度.增强动脉期扫描所有病灶均有明显强化且除中心疤痕外病灶强化均匀一致,其中7例还可见到病灶中心或周边增粗、扭曲的动脉.门脉期和延迟期扫描11个病灶为等密度或略低密度,2个为略高密度.6例伴有中心疤痕者,4例无强化,2例有延迟强化.结论:螺旋CT多期扫描可充分反映FNH的血供特点和病理特征,在诊断和鉴别诊断中具有很大价值.“,”Objective: To discuss the appearances of focal nodular hyperplasia (FNH) of the liver on the multiphase helical CT scanning, and to improve its diagnostic accuracy with CT.Materials and Methods:Helical CT scanning of pre and postcontrast arterial phase, portal venous phase and delayed phase was performed in 13 cases with surgically and pathologically proved FNH.Results:On precontrast scans, 11 of 13 FNH lesions were hypodense (either homogeneous or nonhomogeneous), the other two lesions were isodense. On the arterial phase scans, all lesions were markedly and homogeneously enhanced, except for the central scar area. Tortuous and dilated arteries were seen at the center or peripheral area in 7 out of 13 lesions. On the portal phase and delayed phase scans, 11 of 13 lesions turned to isodense of slightly hypodense, two lesions remained slightly hyperdense. Central scar was found in 6 FNH lesions, 4 of them showed no enhancement while the other two demonstrated late enhancement.Conclusion: Multiphase helical CT scanning can fully reflect the blood supplying and pathologic features of FNH, and, therefore, it is of great value in diagnosing and differentiating FNH.