腺腺淋巴瘤的CT、MRI表现特征

目的：探讨腮腺腺淋巴瘤的，临床及CT、MRI表现特征。方法：回顾性分析经组织病理学证实的24例腮腺腺淋巴瘤患者的临床及CT、MRI表现特点，着重观察其部位、大小、形态、边缘、CT密度或MRI信号、强化形式等。结果：24例均为中老年男性，20例有嗜烟史。24例CT和MRI共发现56个病灶，其中单发9例，多发15例。49个病灶位于腮腺浅叶，7个病灶跨叶，32个病灶位于腮腺浅叶后下极。病灶长径0．3～4．6cm，平均长径约2．9cm。53个病灶包膜完整，边缘清楚。30个病灶呈实性，26个呈囊实性，囊变区呈裂隙状或分隔状。实性部分CT表现为密度均匀肿块，增强多呈中度至明显强化。MRI平扫病灶信号均匀或不均匀，T1WI呈等或稍低信号，T2WI呈稍高信号。增强多呈早期明显强化、延迟期强化减低。部分病灶可见血管包绕或小血管穿行，邻近下颌后静脉受压推移。结论：腮腺腺淋巴瘤的，临床和CT、MRI表现具有一定特征性，分析其CT和MRI表现并结合临床资料，可为诊断提供重要参考。

CT and MRI characteristics of parotid adenolymphoma

Objective：To evaluate the clincal,CT and MRI characteristics of parotid adenolymphoma so as to promote our understanding of the disease. Methods ： Twenty-four patients with parotid adenolymphoma verified by histopathology were collected. The clincal,CT and MRI features were retrospectively analysed, and position, size, shape, margin, density, signal intensity and enhancing patterns were mainly observed. Results： All 24 patients were males and had smoking hobby. Fifty-six lesions in 24 patients were detected by CT or MRI,among which single lesion in 9 cases and multiple lesions in 15 cases. Forty-nine lesions were located in parotid superficial lobes. The long diameter of lesions was 0. 3--4. 6cm, with a mean of 2.9cm. Fifty-three lesions had intact capsule and showed well-defined margins. Thirty lesions were solid,26 lesions were cystic solid and the cysts manifested as crannied and septate. The solid parts on CT had homogeneous density and were moderately or intensively enhanced after injecting contrast medium, plain scan of MRI showed homogeneous or unhomoge- neous,iso-intense or mildly low signals on T1WI and mildly high signals on T2 WI. They were obviously enhanced in early phases and slightly enhanced in delayed phases. Some lesions were surrounded or traversed by small vessels. The neighboring retro mandibular vein were compressed. Conclusions：Parotid adenolymphoma possesses certain characteristics on CT and MRI images,which, through analysis and in combination with clincal manifestations, can be valuable in the diagnosis of this disease.