1 Some brain cancers occur when one type of cell transforms from its normal characteristics. 2  Once transformed, the cells grow and multiply in abnormal ways. 3  As these abnormal cells grow, they become a mass, or tumor. 4  The brain tumors that result are called primary brain tumors because they originate in the brain.etastatic brain tumors are made of cancerous cells from a tumor elsewhere in the body. The cells spread to the brain from another tumor in a process called metastasis. This is the most common type of brain tumor.
How Long Does a Stress Test Take? While the exercise stress test itself usually takes around 10 or 15 minutes, part one of the test takes about 30 or 45 minutes total. Dr. Willke suggests blocking off most of your morning, because you will need to go in for follow-up photos about two hours later, for the second part of the test.
When the test is done, the electrodes are removed. Nerve conduction studies are done before an EMG if both tests are being done. Nerve conduction tests may take from 15 minutes to 1 hour or more. How long the tests take depends on how many nerves and muscles are studied.