الفهرس 
Magnetic Resonance Imaging of FocalOnly 14 pages are availabe for public view
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Abstract
Background: The incidence of incidentally detected focal liver lesions (FLL) parallels growth in imaging utilization. The majority of FLL arising in non-cirrhotic livers are benign. Hemangiomas, focal nodular hyperplasias (FNH), and adenomas (HCA) are the most commonly encountered solid benign lesions. The main goals of MRI liver techniques are detection & characterization of equivocal hepatic focal lesions with indeterminate results by other diagnostic modalities e.g. US or CT. The goal of MRI in liver oncologic patients includes liver tumor detection & characterization. It also has revealed a good performance especially regarding differential diagnosis of liver neoplasms. MRI provides multiplanar information in great range of liver lesions & makes successful diagnosis when other modalities fail, it provides details of vessels & bile ducts giving the best way to diagnose, stage hepatic tumors & assess their blood supply. Nowadays dynamic contrast-enhanced 3D GRE MR imaging is excellent for the evaluation of various hepatic tumors. Dynamic contrast enhanced MRI provides the most information about lesion characterization in general, & it is most helpful in distinguishing liver lesions types & in assessing their response to therapy. Magnetic resonance imaging, MRI has more advantages than ultrasound, computed tomography, CT, positron emission tomography, PET, or any other imaging modality in diagnosing focal hepatic masses. With a combination of basic T1 and T2 weighted sequences, diffusion weighted imaging, DWI, use of different contrast agents, most liver lesions can be adequately diagnosed.