Meningiomas are common tumors of the brain membranes and statistically account for 15-18% of all intracranial tumors. Meningiomas are more common around the age of 60, and the risk of their formation increases with age.
A tumor arising in the sheaths of the spinal cord (meninges spinalis) is defined as a spinal meningioma because the spinal cord is located in the spinal canal.
Oncologists subdivide cancer not only by the localization of the tumor, but also by the type of cells from which it was formed. And blastoma is defined when the neoplasm is derived from blasts - immature (embryonic) undifferentiated cells.
A well-defined, horseshoe-shaped or spherical tumor that develops on the base of the dura mater is a meningioma of the brain. The neoplasm resembles a peculiar nodule that often fuses with the dural sheath.
Parietal meningioma or parietal meningioma is a tumor that originates from modified meningothelial cells of the middle cerebral membrane with attachment to the inner layer of the dura mater over the parietal lobes (lobus parietalis) of the cerebral cortex.
In oncology, squamous cell carcinoma or squamous cell cancer is defined as a specific histologic type of malignant tumor that develops from pathologically modified squamous epithelial cells
Astrocytoma of the spinal cord is about 9 times less common than brain tumors and mainly affects adults. In most cases, benign astrocytomas become malignant - this occurs in about 70% of patients.
According to the classification of the World Health Organization, diffuse astrocytoma of the brain refers to grade II malignancy of tumor processes - primary brain neoplasms.
Astrocytoma is a tumor focus in the brain, which develops from specific cells of the nervous tissue - astrocytes. Such cells have a star-shaped shape, which determined their name. Such tumors are different, including the degree of malignancy.
