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《Journal of Clinical Radiololgy》 2005-11
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CT Manifestation of Malignant Tumor of the Parotid Gland

HUANG Shufeng, GU Yajia, WU Bin,et al. Department of Radiology, Cancer Hospital, Medical College of Fudan University, Shanghai 200032, P. R. China  
Objective To evaluate the significance of U line (connecting the most dorsal point on the ipsilateral half of a vertebra to the dorsal side of the retromandibular vein) to define the extension of parotid tumor, as well as the value of CT to assess the malignant parotid tumor in different pathological subtype. Materials and Methods CT appearances of 32 cases with primary malignant parotid tumor proved by pathology were analyzed, the "U" line was used to define the location (deep or superficial lobe) of the parotid tumor. Results (1)Low-grade epithelial parotid carcinomas were appeared as mass with clear or partly clear boundary, regular in shape, patchy of necrosis, the tumor were markedly enhanced and rarely bilaterally involvement. (2)Medium and high-grade malignant parotid tumor usually had ill-defined margin, irregular in shape, large patchy necrosis with markedly enhancement, always bilateral involvement and infiltration of adjacent structure as well as lymph node metastasis. (3)Malignant lym-phomas were appeared as multiple masses of homogeneous density and well-defined, unilateral or bilateral involvement with slight enhancement. (4)The accuracy of U line in defining the extension of parotid tumor was 70.4% . Conclusion CT plays an important role in diagnosis of malignant parotid tumor of different biological behavior and histological subtype. U line has limitation in evaluating the malignant parotid tumor, accuracy can be improved to 88.9% with the combination of evaluating involvement of sty-loid-mastoid space as well as the retromandibular vein.
【CateGory Index】: R739.8
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