脑膜包括硬脑膜、软脑膜、蛛网膜。通常所说的柔脑膜病变包括软脑膜、蛛网膜和蛛网膜下腔的病变。多种病变可累及脑膜,各种脑膜炎性病变早期均为蛛网膜下腔和柔脑膜血管周围的炎性细胞浸润并血管扩张充血,或为蛛网膜下腔纤维组织增生,柔脑膜血管增生。脑膜转移瘤尤其是通过脑脊液播散者,瘤细胞弥漫散布于蛛网膜下腔中,在蛛网膜下腔沉积、生长,病变较轻的区域脑实质表层不受累,病变较重的区域常可见到脑实质表层被累及,同时血管周围间隙中常充满瘤细胞。脑脊液转移还易累及包绕神经的脑膜。根据 Meninges include dura, pia mater, arachnoid. Commonly referred to leptomeningeal lesions include pia mater, arachnoid and subarachnoid lesions. A variety of lesions can be involved in the meninges, all kinds of early meningitis lesions are subarachnoid and lentilamputaneous inflammatory cell infiltration and vascular dilatation and congestion, or subarachnoid fibrous tissue proliferation, meningeal vascular proliferation. Meningeal metastases, especially through the cerebrospinal fluid disseminator, tumor cells were diffusely distributed in the subarachnoid space, deposition in the subarachnoid space, growth, lesion lesion in the brain parenchyma surface is not involved, often seen in areas of severe lesions Brain parenchymal surface is involved, while the blood vessels around the gap often filled with tumor cells. Cerebrospinal fluid is also easily involved in the transfer of meninges around the nerves. according to