The tumor is mainly located in white matter, showing invasive growth. Solid tumors have no obvious boundary, and most of them are not limited to one lobe. Outward growth can invade the cortex and destroy the deep structure, or invade the contralateral cerebral hemisphere through the corpus callosum and cross the midline. Tumors with cystic changes can be called "cystic tumors". Astrocytoma located in cerebellum is usually a large cyst with tumor nodules on the wall, which is composed of fibrous connective tissue and glial fibers. Therefore, only by removing tumor nodules can we achieve the goal of radical cure. This kind of tumor is called "intracystic tumor". A few cerebellar astrocytomas are solid and invasive, with no obvious boundary, and the prognosis is worse than that of cystic patients.

2. Anaplastic or malignant astrocytoma

Mainly seen in the brain, the tumor is large, sometimes invading several lobes or crossing the midline to invade the contralateral cerebral hemisphere. The tumor tissue is grayish red, soft in texture, infiltrating into the brain, and has a certain boundary with the surrounding brain tissue. Tumor cells can infiltrate into the cortex and form a "satellite phenomenon" around neurons. There are cystic changes and local bleeding and necrosis.

3. Hairy cell astrocytoma

Hairy cell astrocytoma grows slowly and comes from neuroepithelial tissue tumor. Tumors often occur in the white matter and cerebellar hemisphere of the midline structure, especially in the funnel, sometimes called funnel tumors; Optic nerve glioma is called optic nerve. Tumors occurring in anterior visual pathway, hypothalamus and brain stem have unclear boundaries, most of which are substantial and rich in blood supply.