الفهرس 
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Abstract
Focal liver lesions are common in the general population. They are variable between benign and malignant nature. Differentiation between malignant and benign FLLs and establishing the correct diagnosis are of great importance in treatment planning for patients with liver neoplasms and in patients without neoplasms for avoiding unnecessary liver biopsies. This study aimed at evaluation of the role of perfusion MRI, utilizing THRIVE technique (T1- weighted High Resolution Imaging with Volume Excitation) in characterization of focal hepatic lesions. This study included 25 patients, diagnosed to have different hepatic focal lesions either by Ultrasound or CT. Patients were submitted to dynamic MRI examination including perfusion study, using THRIVE technique. The dynamic MRI study revealed : 17 typically malignant lesions (12 HCC, 2 Cholangiocarcinoma and 3 metastatic). 8 typically benign lesions (7 hemangioma and 1 FNH). After performing perfusion study, the resultant Time-intensity curves varied in correlation with each cas : Type I curve (rapid ascent with rapid descent); was detected in 10 cases out of 12 cases of HCC. Type II curve (progressive ascent with no descent); was detected in 6 cases out of 7 cases of hemangioma Fluctuating curve of metastasis; was detected in 2 cases out of three cases of metastasis.