الفهرس 
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Abstract
This study was carried out at the MRI unit of radiology department at Mansoura University Hospital between November 2015 and March 2018. It included 100 patients: they were classified into patients with mediastinal masses (n=52) and patients with pulmonary masses (n=40) and patients with pleural masses (n=8). All the patients underwent MRI examination (T1-WI, T2-WI, fat sat and DWI using b value of 0, 500 and 1000). In our study we detected that the signal intensity of the lesions on DWI can be helpful in differentiating malignant and benign lesions. However, depending only on the qualitative or visual assessment to differentiate benign from malignant masses is not sufficient, because some lesions showed atypical imaging features. As regard the mediastinal masses included a cutoff value 1.25×10ˉ³mm²/s was considered to be the threshold for differentiating benign from malignant masses, the sensitivity and specificity were 94.4% and 86.2%, respectively. And for pulmonary masses included a cutoff value 1.4×10ˉ³mm²/s was considered the threshold for differentiating benign from malignant masses, the sensitivity and specificity were 93.8% and 75%, respectively. The number of cases with pleural masses in our study was too small to get a ROC curve analysis or detect cutoff value between benign and malignant lesions.