目的　探讨咽淋巴环影像解剖特点，进一步分析口咽部非霍奇金淋巴瘤PET/CT和MRI表现。  方法　 回顾性分析30例临床病理资料完整的口咽部非霍奇金淋巴瘤的影像资料，所有患者治疗前均行PET/CT及MR检查，两种检查时间间距不超过14 d。结合咽淋巴环解剖影像解剖特点，分析病灶的分布、形态、MRI信号特点、强化特征、SUVmax值以及淋巴结转移方式。 结果   30例中B细胞来源占76.7% (23例)，外周T细胞占16.7%（5例）和NK/T细胞占6.7% (2例)。63.3%（19例）腭扁桃体受累。病变表现肿块型10例，弥漫型8例，混合型12例。CT平扫表现为等或稍高密度，增强后轻度均匀强化。MRI检查病灶T1WI呈等或略低信号，T2WI为等或略高信号。PET/CT原发灶SUVmax值达11以上25例（83.3%）。所有患者均存在不同程度咽旁间隙受压变窄，但MRI上高信号的脂肪仍存在，口咽部粘膜完整。25例合并颈部淋巴结转移，其中22例转移淋巴结无坏死，3例转移淋巴结出现中心坏死。  结论　口咽部NHL在发病部位、形态、肿瘤的信号、SUVmax值、周围组织结构的侵犯和颈部淋巴结转移都有一定的解剖学及影像学特征，PET/CT和MRI对于口咽部非霍奇金淋巴瘤的鉴别诊断和病变范围的判断有重要价值。

Objective　To study the anatomy and imaging features of Oropharyngeal in non-Hondgkin's lymphoma (NHL) by PET/CT and MRI to improve the diagnosis of NHL.　Methods　The 30 cases diagnosed as NHL through clinical and pathologic tests were retrospectively analyzed in regard to appearance, location, signal, enhanced features, SUVmax and metastasis by PET/CT and MRI.　Results　Of 30 cases, 21 cases of Oropharyngeal NHL originated from B-cell（76.7%）, 5 cases from T-cell （16.7%），and four cases from NK/T-cell （6.7%）. The tonsil was the most vulnerable site （n=19）.  Three types in appearances of lesions could be observed. Specifically,  10 cases were mass type, 8 cases diffusion type, 12 cases mixed type. On plain CT scans, the lesions manifested as iso-or slightly hyper-density masses, and showed homogeneous and even enhancement after contrast injection. On T1WI, the lesions were isointense or slightly hypointense signal while on T2WI those were isointense or slight hyperintese signa1. SUVmax of primary tumors was increased significantly(n=25). All cases showed narrowing of the parapharyngeal space, but the high signal of the fat was showed on MRI; Coincidently, mucosae of pharynx oralis was continuous. Cervical lymph nodes were involved in 25 cases, and the density was homogeneous in 22 cases, a few metastases (3 cases) appeared as necrosis or cyst.　Conclusion　Oropharyngeal NHL have some characteristic imaging features of the position, SUVmax, shape and range of lymphoma of Oropharyngeal and metastases in lymph nodes and infilatration changes of its surrounding tissue. PET/CT and MRI are of crucial importance in the diagnosis and treatment of oropharyngeal NHL.