Final answer:
The noninvasive test that is most likely to be ordered to validate the presence of a brain tumor is magnetic resonance imaging (MRI). MRI uses a magnetic field and radio waves to create detailed images of the brain. It can provide information about the size, location, and characteristics of a brain tumor.
Step-by-step explanation:
The noninvasive test that is most likely to be ordered to validate the presence of a brain tumor is magnetic resonance imaging (MRI). MRI uses a magnetic field and radio waves to create detailed images of the brain. It can provide information about the size, location, and characteristics of a brain tumor.
Unlike computed tomography (CT) scan, which is also a noninvasive imaging technique but uses X-rays, MRI does not involve exposure to ionizing radiation. MRI is preferred because it provides better resolution and can differentiate between different types of brain tissue.
Electroencephalogram (EEG) is used to record brain activity and is not primarily used to diagnose brain tumors. Lumbar puncture, on the other hand, involves inserting a needle into the spinal canal to collect cerebrospinal fluid and is not typically used to directly diagnose brain tumors.