It is when there is a development of abnormal cells in the brain tissue that form a lump or growth, whether benign or malignant.
When it originates in the brain, we speak of a primary tumor, while if its origin is metastatic, that is, it began in other areas of the body and spread to the brain, it is a secondary tumor.
In the case of cancerous tumors, the growth rate is accelerated, while those of a benign nature usually develop slowly, although the degree of neurological involvement depends on the type of tumor, its volume, and its location.
Contrary to what happens with infants, in adults, primary tumors are less common than secondary ones.
According to the type of cells where they originate, primary brain tumors are classified mainly into:
- Schwannomas: they are benign and affect the nerves responsible for hearing and balance abilities.
- Adenomas: located in the pituitary gland, causing hormonal effects.
- Gliomas: originate in brain tissue or spinal cord.
- Meningiomas: they are benign and appear in the meninges.
- Medulloblastomas: are cancerous and spread through the cerebrospinal fluid.
Secondary brain tumors can appear due to any type of cancer originating in any area of the body, but the oncological conditions that most frequently generate them are those that affect: