Nodular regenerative hyperplasia (NRH) of the liver is a condition characterized by multiple monoacinar regenerative nodules in the absence of fibrous septa. When these nodules become confluent they may be seen with sonography or CT. The appearance of these pseudotumoral pattern of NRH has been scarcely described with MRI. We present the imaging findings of five patients with NRH and a pseudotumoral form at sonography. Sonography depicted hyperechoic lesions in four patients and hypoechoic lesions in another. Computed tomography showed hypodense lesions with little contrast enhancement in two patients. Three patients showed subtle focal liver lesions on MRIisointense in one, mildly hypointense in another, and minimally hyperintense in a patient with siderosis. The dynamic behavior at MRI was similar to the normal liver parenchyma. Hyperechoic lesions on sonography or hypodense lesions on CT, barely or not seen on MRI, can be indicative of NRH in an appropriate clinical setting.

译文

肝脏的结节性再生增生(NRH)是一种疾病,其特征是在没有纤维间隔的情况下出现了多个单腺泡再生结节。当这些结节汇合时,可以通过超声检查或CT看到。 MRI几乎没有描述这些NRH假瘤型的出现。我们在超声检查中显示了5名NRH和假瘤形式的患者的影像学表现。超声检查显示四名患者出现高回声病变,另一名患者出现低回声病变。计算机断层扫描显示两名患者的低密度病变,对比增强很少。 3例患者在MRIisointense上显示出细微的局灶性肝损害,另一例患者表现为轻度低点,铁锈病患者显示为最低程度的高强度。 MRI的动态行为与正常肝实质相似。在适当的临床环境中,超声检查中的高回声病变或CT上的低密度病变(在MRI上几乎未见或未见)可指示NRH。

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