鼻腔鼻窦NK/T细胞淋巴瘤的CT和MRI诊断价值

目的：探讨CT和MRI对鼻腔鼻窦NK/T细胞淋巴瘤的诊断价值。方法回顾性分析2010年7月至2015年4月间经手术病理证实的20例NK/T细胞淋巴瘤患者的CT和MRI图像资料。重点观察病变部位、侵犯范围、CT密度、骨质破坏、MR信号特点、强化程度以及周边软组织和淋巴结的累及情况。结果20例患者均行CT平扫检查，表现为均匀等密度肿块，CT值介于42~69 Hu。8例伴浸润性骨质破坏，未见肿瘤灶内钙化灶形成。16例行鼻窦MRI检查，T1加权像均呈等信号，其中13例信号均匀，3例信号不均匀。12例在T2加权像上呈高信号，4例呈等信号，其中10例信号均匀，6例信号不均匀。12例表现为中度强化，4例表现为轻度强化。结论 CT和MRI能清楚地显示鼻腔鼻窦淋巴瘤的范围，部分特征性的影像学表现可帮助术前诊断。

Value of CT and MRI in the diagnosis of NK/T cell lymphoma in nasal and paranasal sinus

Objective To evaluate the diagnostic value of CT and MRI in the NK/T cell lymphoma in nasal and paranasal sinus. Methods CT and MRI images of twenty patients with surgically confirmed NK/T cell lymphoma, who were enrolled in this study from July 2010 and April 2015, were retrospectively reviewed and analyzed with focus-ing on the lesion location, invasive range, CT density, MRI signal features, calcification degree and involvement of sur-rounding parenchyma and lymphonoduli. Results All 20 lesions showed iso-density on CT images with no obvious cal-cification (CT value range:42~69 Hu). Of these, 8 cases of bone destruction without calcification tumor were observed. Among 16 cases undergoing MRI examinations, all the lesions showed homogeneous (n=13) or heterogeneous (n=3) isointensity on T1WI, and hypointensity signal (n=12) or isointensity signal (n=4) on T2WI, with homogeneous (n=10) or heterogeneous (n=6) signal intensity. Moderate enhancement occurred in 12 patients and mild enhancement in 4 pa-tients. Conclusion CT and MRI can accurately demonstrate the lesion location and invasive range of lymphoma in na-sal and paranasal sinus, and some imaging features can be helpful for preoperative diagnosis.