Tumors that initially arise and grow within the brain are termed primary tumors
The most common primary brain tumors include gliomas such as astrocytomas, ependymomas, and oligodendrogliomas
Gliomas are the most prevalent primary brain tumors
Most primary bone tumors are benign.Malignant primary bone tumors account for fewer than 1% of all cancers diagnosed in the United States.
Most adult brain cancers are not primary tumors, but are the result of primary cancer that has spread from other areas of the body
Malignant primary bone tumors account for fewer than 1% of all cancers diagnosed in the United States
A primary lesion includes abscesses, ulcers and tumors.
They represent more than 20% of all primary brain tumors
The cause of primary brain tumors is unknown, but people who work with rubber and certain chemicals have a greater-than-average risk of developing them
Pleural tumors are divided into two classifications: primary (mesothelioma), or metastatic (arising from cancer sites elsewhere in the body).
The incidence of primary intracranial tumors is 11.5 per 100,000, or approximately 35,000 persons per year
Many tumors, or polyneoplasia, means there are more than 3-4 tumors present. Generally this indicates the primary neoplasia (the original tumor) has spread to other organs or lymph nodes.
Johan L. Slooff has written: 'Primary intramedullary tumors of the spinal cord and filum terminale' -- subject(s): Spinal cord, Tumors