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目的:探讨鼻腔原发性恶性黑色素瘤的CT及MRI特征,以帮助诊断。方法:经病理证实的13例鼻腔原发性恶性黑色素瘤患者(女8例,男5例,平均年龄70.8岁)纳入研究,分析其CT及MRI表现,包括病灶部位、侵及范围、骨质破坏、密度/信号特点以及增强后强化程度等。结果:12例病灶发生在单侧鼻腔,1例发生在双侧;12例(12/13)邻近骨质吸收伴部分破坏;肿瘤呈稍低、等及稍高的软组织密度;9例(9/12)在T2WI上与脑实质信号比较呈等或稍低信号,3例(3/12)呈等、高混杂信号,2例(2/12)在T1WI上呈明显高信号,10例(10/12)呈等及稍低信号;增强扫描后3例(3/12)明显强化,9例(9/12)呈轻中度强化。结论:CT和MRI能很好地显示肿瘤的部位、周围骨质破坏和邻近重要结构的侵犯,鼻腔原发性恶性黑色素瘤MR-T2WI等或稍低信号、轻中度强化,具有一定的特征性可帮助诊断;但T2WI稍高信号表现是不典型的,诊断需依靠病理检查。
Objective: To investigate the CT and MRI features of nasal primary malignant melanoma in order to help the diagnosis. Methods: Thirteen patients with nasal primary malignant melanoma (8 males and 5 females, mean age 70.8 years) confirmed by pathology were enrolled in the study. CT and MRI findings were analyzed including lesion location, extent of invasion, bone mass Damage, density / signal characteristics and enhance the level of enhancement. Results: Twelve lesions occurred in the unilateral nasal cavity and one in both sides. In the 12 cases (12/13), the adjacent bone resorption partners were partially destroyed. The tumors showed slightly lower and higher soft tissue densities. Nine cases (9 / 12) showed equal or slightly lower signal on T2WI compared with brain parenchyma signal, 3 (3/12) showed equal and high promiscuous signal, 2 cases (2/12) showed obviously high signal on T1WI, 10 10/12) showed equal and slightly lower signal; enhanced scanning in 3 cases (3/12) was significantly enhanced in 9 cases (9/12) was mild to moderate enhancement. Conclusion: CT and MRI can show the location of the tumor, the surrounding bone destruction and the adjacent important structures, the nasal malignant melanoma MR-T2WI or slightly lower signal, mild to moderate enhancement, with certain characteristics Sex can help diagnosis; but T2WI slightly higher signal performance is not typical, the diagnosis depends on the pathological examination.