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《Chinese Journal of Radiology》 2005-04
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The CT and MRI diagnosis of parotid adenolymphomas

LIU Qi-shun *, LIANG Chang-hong, HUANG Biao, ZHANG Zhong-lin, LIU Yan-hui, LIN Hua-huan. *Department of Radiology, Guangdong Provincial People′s Hospital, Guangzhou 510080, China  
Objective To investigate the characteristics of CT and MRI manifestations of adenolymphomas of the parotid gland. Methods The CT and MRI characteristics of 30 cases (37 sides, 44 lesions) with operation and pathology confirmed adenolymphomas were studied retrospectively. The imaging characteristics analysis included the number, position, size, shape, density and intensity of signal of the focus. In this article 4 quadrants in sagittal section of the parotid gland were created to help the diagnosis. Among 30 cases, 29 (96.67%) patients were male, 26 (86.67%) patients were more than 50 years old. Results Forty-four lesions were found among 30 cases (37 sides). 56.82%(25/44) adenolymphomas were located in the posterior and inferior quadrant. Multiple synchronous adenolymphomas in one side or bilateral parotids were found in 33.33% (10/30). The margins in 42 lesions were well-defined. The mean CT value of 32 lesions (22 cases with CT scanning) increased (29.27±14.11) HU after contrast administration. Delay enhancements of the lesions were observed in 3 lesions in 3 cases. 12 lesions (8 cases with MR) were all inhomogeneous in signal, presenting as intermediate signal intensity on T_1WI, heterogeneous high and intermediate signal intensity on T_2WI, and slight-marked inhomogeneous enhancement after contrast administration. Conclusion Adenolymphomas of the parotid should be first considered when the male patient over 50 years has lesions located in the posterior and inferior quadrant and with well-defined margin, especially when the lesion is multiple or bilaterally located.
【CateGory Index】: R739.8
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