title: DWI/ADC in Differentiation of Benign from Malignant Focal Liver Lesion.
abstract: METHODS
  The study was of prospective-retrospective character. It was carried out at the AKH in Vienna (Austria), where 100 patients with focal liver lesions were included in the study. All patients underwent the routine MR sequences on appliances 1,5 and 3T (Siemens, Germany): T1, T2, HASTE, VIBE, and a DWI with three b values (b 50, b 300 b 600 s / mm2) and ADC map with ROI (regions of interest). The numerical value of ADC map was calculated, where n = 100 liver lesions, by two independent radiologists.
  
  
  RESULTS
  On the basis of matching the PH finding statistically we get DWI accuracy of 96.8% for the assessment of liver lesions. The average numerical value of ADC in benign hepatic lesions (FNH, Hemangiomas) in our study amounted to 1.88 (1.326 to 2.48) x103mm2/s, while the value of malignant liver lesions (HCC, CCC, CRCLM) were significantly lower and amounted to 1.15 (1.024 to 1.343) x10-3mm2/s (Figure 2). Differences between the mean ADC of benign and malignant lesions showed a statistically significant difference with p <0.0005. In our research, we get cut-off for the ADC value of 1,341x10-3mm2/s, which proved to be the optimal parameter for differentiation between benign and malignant lesions.
  
  
  CONCLUSIONS
  Measuring ADC values with DWI as an additional MRI tool can help in oncological practice by distinguishing normal liver parenchyma from focal lesions, and in differentiating benign from malignant liver lesions, particularly in cases where administration of contrast is not possible.
authors.affiliation: Clinic of Radiology, Clinical Center of Sarajevo University, Sarajevo, Bosnia and Herzegovina.
authors.forename: Elma
authors.initials: E
authors.lastname: Jahic
authors.affiliation: Clinic of Radiology, Clinical Center of Sarajevo University, Sarajevo, Bosnia and Herzegovina.
authors.forename: Amela
authors.initials: A
authors.lastname: Sofic
authors.affiliation: Institute of Gastroenterology, Clinical Center of Sarajevo University, Sarajevo, Bosnia and Herzegovina.
authors.forename: Azra Husic
authors.initials: AH
authors.lastname: Selimovic
keywords: apparent diffusion coefficient; diffusion weighted imaging; focal liver lesions