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《Contemporary Medicine》 2009-20
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Imaging Features and Pathology Analysis of Parotid Adenolymphoma

Qing-cong KONG,Xing-he DENG,Wei-min LIU,Xiao-hong WANG,Yun-ya LIN,Hong SHAN Department of Radiology,The Third Affiliated Hospital of Sun Yat-sen University,Guangzhou 510630,China  
Objective To analyze the imaging features of the parotid adenolymphomas,and compare with the corresponding pathological findings. Methods A total of 41 cases with parotid adenolymphomas confirmed by pathology and immunohistochemistry were retrospectively reviewed. There were 39 men and 2 women,the age ranged from 30-75 years,withmean 60.2 years. Twenty-five patients under-went plain and contrast-enhanced CT scans,and 16 underwent MRI examinations. The following imaging features were analyzed:number,position,size,shape,CT density,and MRI signal intensity of these foci. Results Sixty lesions were found among 41 cases. Multiple adenolymphomas in one side or bilateral parotids were found in 24.4% (10/41). The diameter ranged 0.6cm to 4.6cm (mean,2.5 cm). The margins in 58 lesions were well-defined (96.7%). 25 cases with CT examination found 35 lesions,20 of which appeared as mixed density with cystic necrosis. In contrast-enhanced CT scans,inhomogeneous enhancement was seen in the lesions bigger than 2.5 cm in diameter. Delay enhancements of the lesions were observed in 2 lesions. Twenty-five lesions (16 cases) on MRI were all inhomogeneous in signal,presenting as intermediate or low signal intensity on T1WI,heterogeneous high and intermediate signal intensity on T2WI,and slight to marked inhomogeneous enhancement after contrast administration. The corresponding pathologic findings of these masses were round or oblate,with integrated envelope. The tumor was composed of epithelium and lymph-type tissue. Conclusion Adenolymphomas of the parotid should be firstly considered when the male patient over 50 years has lesion with well-defined margin,locating in the posterior and inferior quadrant of the parotid and,especially for multiple or bilateral foci.
【CateGory Index】: R739.8
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