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The prognosis for brain metastases is variable; it depends on the type of primary cancer, the age of the patient, the absence or presence of extracranial metastases, and the number of metastatic sites in the brain. [6] For patients who do not undergo treatment the average survival is between one and two months. [6]
CNS metastasis is the spread and proliferation of cancer cells from their original tumour to form secondary tumours in portions of the central nervous system. [ 1 ] The process of tumour cells invading distant tissue is complex and obscure, but modern technology has permitted an enhanced detection of metastasis .
There are over 120 types of brain and spinal cord tumors. [2] In the CNS a tumor may be a malignant secondary tumor having metastasised (spread from a primary site in the body). Secondary tumors are more common in adults. [2] Treatment and prognosis depend on factors such as the type of tumor, location, and molecular characteristics. [1]
Metastatic tumors are very common in the late stages of cancer. The spread of metastasis may occur via the blood or the lymphatics or through both routes. The most common sites of metastases are the lungs, liver, brain, and the bones [10]
The most common symptoms of CNS tumors are headache, vomiting, and nausea. Symptoms vary depending on the tumor and may include unsteady gait, slowed speech, memory loss, loss of hearing and vision, problems with memory, narrowing of visual field, and back pain. Symptoms may also vary greatly between individuals with the same tumor type.
[5] [8] Signs and symptoms vary according to tumor site, and prognosis is closely tied to the location of the primary tumor. Common sites of metastasis include the lungs, bone marrow, and bones. [9] [10] There are many classification systems for RMS and a variety of defined histological types. Embryonal rhabdomyosarcoma is the most common type ...
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Metastasis to dural structures generally occurs by hematogenous spread or direct invasion from a contiguous bone. Dural metastases can invade the underlying brain and cause focal edema and associated neurologic symptoms. These processes tend to cause seizures early in the course because of their cortical location. Metastasis to the ...