الفهرس 
Normal Anatomy of the NeckOnly 14 pages are availabe for public view
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Abstract
Summary
The aim of this thesis is to determine the role of diffusion weighted (DW) magnetic resonance imaging in evaluation of solid neck masses.
The study included thirty patients (17 male and 13 female). Histopathologically the examined neck masses in our study were divided into 2 categories: (A) Malignant lesion 46.7% (n = 14) subdivided as follows; squamous cell carcinoma (n = 8), adenoid cystic carcinoma (n = 4), thyroid cancer (n = 1) and metastatic anaplastic carcinoma (n = 1) (B) benign lesions 53.3% (n = 16) subdivided into Reactive lymphdenopathy (n = 7), thyroid nodules (n = 2), mature teratoma (n = 1), ameloplastoma (n = 1), submandibular adenitis (n = 1) and post-operative benign finding (n = 4) The DWI was obtained with b values including 50, 400, 800 and 1000 mm2/second. The Apparent Diffusion Coefficient (ADC) generated by measuring identical images at different b-values and represented as ADC map from which ADC value calculated. The diagnosis was confirmed after the MRI examination by histologic biopsy according to standard histopathological procedures.
These results revealed that the mean ADC value of benign and malignant solid neck tumors was (2.05 ± 0.46) x10ˉ³mm²/s and (0.82± 0.19) x10ˉ³mm²/s, respectively. There was a significant difference in the mean ADC value between benign and malignant solid neck tumors (P < 0.01). The mean ADC value of benign was significantly higher than that of malignant