Smirniotopoulos J G, Yue N C, Rushing E J
Department of Radiologic Pathology, Armed Forces Institute of Pathology, Washington, DC 20306-6000.
Radiographics. 1993 Sep;13(5):1131-47. doi: 10.1148/radiographics.13.5.8210595.
The cerebellopontine angle cistern is a cerebrospinal fluid-filled space bound by the pons, cerebellum, and petrous temporal bone. Masses in this region are readily identified on cross-sectional images. Differential diagnosis of masses in this region can be simplified by using an algorithmic approach that combines morphologic and enhancement characteristics with established demographic data. Schwannomas are enhancing, round masses, most commonly arising from the vestibular nerve near the porus acusticus and associated with enlargement of the internal auditory canal. Meningiomas are enhancing, oval or hemispheric lesions with a broad attachment to the tentorium or petrous dura mater. Congenital epidermoid inclusion cysts are nonenhancing masses that have undulating margins, molding their shape to conform to the adjacent structures. Aneurysms without significant internal thrombus have prominent flow voids on magnetic resonance images.
桥小脑角池是一个充满脑脊液的间隙，由脑桥、小脑和颞骨岩部围成。该区域的肿块在横断面图像上很容易识别。通过采用一种将形态学和强化特征与既定的人口统计学数据相结合的算法方法，可以简化该区域肿块的鉴别诊断。神经鞘瘤是强化的圆形肿块，最常见于内耳道附近的前庭神经，并伴有内耳道扩大。脑膜瘤是强化的椭圆形或半球形病变，与小脑幕或岩部硬脑膜有广泛附着。先天性表皮样囊肿是无强化的肿块，边缘呈波浪状，其形状与相邻结构相符。无明显内部血栓的动脉瘤在磁共振图像上有明显的流空信号。
