13例肝局灶性结节增生的CT和MR诊断

目的 探讨肝脏局灶性结节增生(FNH)的CT和MR表现及诊断价值。方法 回顾分析13例经手术病理证实为肝脏FNH的CT和MR表现，研究其影像的诊断价值。结果 13例FNH的CT和MR中7例表现较为典型，CT平扫等密度，T1WI为等信号，T2WI为等信号或稍高信号；部分病灶可见中央区低密度瘢痕，增强动脉期除中央瘢痕外均明显强化，门静脉期常见明显强化，延时期多为等密度，瘢痕可稍有强化；术前作出正确诊断。6例FNH表现不典型，CT低密度灶，T1WI为低信号，T2WI为高信号，无瘢痕和轻度强化；术前3例诊断为恶性肿瘤，3例诊断为血管瘤。结论 FNH的CT和MR表现在术前进行综合分析，多数可明确诊断。

Diagnosis of hepatic focal nodular hyperplasia by combination CT and MR imaging

Objective To investigate CT and MR imaging findings of hepatic focal nodular hyperplasia(FNH)and evaluate their diagnostic value.Methods In 13 cases of FNH confirmed pathologically,the CT and MRI imaging features were retrospectively reviewed.Results In 13 cases,7 cases of FNH with typical imaging features:iso density,and iso intensity on T 1WI and T 2WI or slight high signal intensity on T 2WI,strong enhancement arterial phase and slight or obvious enhancement on portal venous phase,slightly delayed enhancement of the central scars were diagnosed correctly before operation.6 cases of FNH had atypical imaging findings:low density,low signal intensity on T 1WI,high signal intensity on T 2WI,no scar and slight enhancement.3 cases were mistaken for malignant tumors and 3 cases were mistaken for hemangioma.Conclusion A correct diagnosis before operation of FNH is possible in the cases with the correlative CT and MR imaging findings.