الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Imaging evaluation of mediastinal lymph nodes has relied on anatomic features of the nodes,notably nodal size, to determine whether they are involved by a neoplasm.
The optimal method for lymph node staging and distinction of malignant or benign states in the mediastinum is controversial. Computed tomography (CT), MRI, positron emission tomography (PET), bronchoscopy, mediastinoscopy, and thoracoscopy were used to resolve this problem.
This study was conducted on thirty-two patients, proved to have thoracic lymphadenopathy that were detected on plain x-ray and contrast enhanced computed tomography studies, two patients were known cases of lymphoma (NHL) and bronchogenic carcinoma who were underwent radiotherapy (used as follow up cases), So excluded from results.
Current aim was to characterize the nature of lymphadenopathy and differentiate benign from malignant causes using diffusion-weighted MR imaging and estimated ADC values.
Patients distributed regarding final pathological diagnosis as 16 benign and 14 malignant lesions. Sarcoidosis represented the majority of examined cases, seen in 6 patients with mean ADC value of 1.36.