鼻窦恶性肿瘤的CT和MRI诊断及窦外侵犯途径

目的：探讨鼻窦恶性肿瘤的CT、MRI表现及其窦外侵犯途径。方法：回顾性分析31例鼻窦恶性肿瘤的CT、MRI资料，根据CT、MRI征象判断肿瘤的侵犯范围及其窦外侵犯途径。结果：鼻窦恶性肿瘤多原发于上颌窦17例（54.8%），其次是筛窦10例（32.3%）和额窦4例（12.9%）。CT、MRI 27例表现边界不清的软组织病灶，CT、MRI增强扫描分别为8、11例表现为低至中度强化。22例病变超出鼻腔鼻窦而侵犯翼腭窝、眼眶等窦外结构。结论：CT、MRI能较准确地显示肿瘤的原发部位及其对窦外结构的侵犯并判断其侵犯途径。

Diagnosis of paranasal sinus malignant tumor with CT and MRI and invasion paths outside of paranasal sinuses

Objective To study the CT,MRI performance and invasion paths outside paranasal sinus malignant tumor.Methods The data of CT and MRI of 31 patients with paranasal sinuses malignant tumor were analyzed,tumor′s invasion scope and invasion paths outside according to the CT,MRI signs and symptoms.(Results Paranasal) sinus malignant tumor root mainly in maxillary sinus 17 cases(54.8%),then ethmoid sinus(10 cases)(32.3%),and frontal sinus 4 cases(12.9%).The CT and MRI results showed soft tissue disease focus was found and its boundary was not clear,enhancement CT and MRI scanning showed 8 and 11 cases had low and middle degrees enhancement,respectively.The pathological changes in 22 cases often be outside the nasal cavity and paranasal sinus but infringed upon the pterygopalatine fossa,orbit.Conclusion CT and MRI can display exactly tumor′s primary focus and its invasion outside the paranasal sinus and judge its invasion path.