目的探讨十二指肠少见原发性 肿瘤MDCT(及MRI)的影像学特征。方法 回 顾性分析29例经临床及病理证实的十二指 肠少见原发性肿瘤的MDCT(或MRI)特征， 并与手术后病理结果对照。结果 十二指 肠少见原发性肿瘤26例。其中间质瘤13 例；原发性淋巴瘤7例，包括弥漫大B细胞 淋巴瘤2例，B细胞淋巴瘤2例，黏膜相关 淋巴瘤1例，外周T细胞淋巴瘤1例，非霍 奇淋巴瘤1例；神经内分泌肿瘤3例；腺瘤 2例；神经鞘瘤1例。结论 十二指肠少见 原发肿瘤具有不同的DSCT及MR影像特征， MDCT(或MRI)具有重要诊断和鉴别诊断价 值。

Objective To investigate the MDCT (and MRI) imaging features of uncommon primary tumors of Duodenum. Methods A retrospective analysis of MDCT (or MRI) features of 29 patients with clinically and pathologically confirmed uncommon primary duodenal tumor, and their pathological findings after surgery. Results Uncommon primary duodenal tumors are diagnosed in 26 cases, wherein 13 cases are stromal tumor; 7 cases are primary lymphoma including 2 cases of diffuse large B-cell lymphoma, 2 cases of B-cell lymphoma, 1 case of mucosa-associated lymphoma, 1 case of peripheral T-cell lymphoma and 1 case of non-Hodgkin lymphoma; 3 cases of neuroendocrine tumors; 2 cases of adenoma; and 1 case of schwannoma. Conclusion Uncommon primary duodenal tumor has different imaging features in DSCT and MR. MDCT (or MRI) has important diagnostic and differential diagnostic value.