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A42-year-oldmanpresentswithpainful,enlargingsofttissuemassoverhisrightmandible.42岁男性，右下颌疼痛、肿大的软组织肿块。
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(A)PostcontrastaxialCTshowsamildlyenhancing,heterogeneous,aggressive,irregularmasswithinfiltratingmargins(arrows)surroundingtherightmandibularramus.(B)BonewindowofaxialCTexhibitsformationofnewbonewithinthemass.(arrowheads)(C)T1-weightedaxialMRIshowsalarge,lobulated,softtissuemass(arrow)hyperintensetomuscles,surroundingtherightmandibularramusandinvolvingthemasseterandpterygoidmuscles(arrow).(D)T2-weightedaxialMRIexhibitsaheterogeneouslyhighT2signalmass(arrow)infiltratingthemasticatorspace.(E)Postcontrast,fat-saturated,T1-weightedaxialMRIexhibitsintenseheterogeneousenhancementofthismass(arrow).
(A)增强后轴位CT显示右下颌支周围轻度强化、不均匀、侵袭性、不规则的肿块，边缘(箭头)浸润。(B)轴位CT骨窗显示肿块内新骨形成。(箭头)(C)T1加权轴位MRI显示一个大的分叶状软组织肿块(箭头)，相对肌肉呈高信号，环绕右侧下颌支，累及咬肌和翼状肌(箭头)。(D)T2加权轴位MRI显示不均匀高T2信号团块(箭头)浸润咀嚼肌间隙。(E)增强后脂肪饱和的T1加权轴位MRI显示肿块不均匀明显强化(箭头)。
DifferentialDiagnosis
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