Weber A L
Department of Radiology, Massachusetts Eye and Ear Infirmary, Boston 02114.
Isr J Med Sci. 1992 Mar-Apr;28(3-4):153-60.
Computed tomography (CT) and magnetic resonance imaging (MRI) are the modalities of choice in the assessment of inflammatory diseases, cysts, benign and malignant tumors found in the orbit. CT delineates, to greater advantage, bony structures and areas of calcification. MRI is superior to CT in visualization of the various soft tissue structures and in providing lesion characterization. The lesion location in the orbit is important: extraconal (frequently lymphomas), intraconal (most commonly cavernous hemangiomas and neurilemmomas), and optic nerve sheath (gliomas and meningiomas). The contours of the lesion are also significant: sharply delineated (benign), irregular, lobulated (lymphoma or lymphoid hyperplasia), or invasive (paranasal tumors). CT and MRI characteristics, in particular contrast enhancement, further contribute to the characterization of the various types of lesions within the orbit.
计算机断层扫描（CT）和磁共振成像（MRI）是评估眼眶内炎症性疾病、囊肿、良性和恶性肿瘤的首选检查方式。CT在显示骨质结构和钙化区域方面具有更大优势。MRI在显示各种软组织结构以及提供病变特征方面优于CT。眼眶内病变的位置很重要：眶锥外（常见于淋巴瘤）、眶锥内（最常见的是海绵状血管瘤和神经鞘瘤）以及视神经鞘（胶质瘤和脑膜瘤）。病变的轮廓也很重要：边界清晰（良性）、不规则、分叶状（淋巴瘤或淋巴样增生）或浸润性（鼻窦肿瘤）。CT和MRI特征，尤其是对比增强，进一步有助于眼眶内各种类型病变的特征描述。
