Which test will the nurse expect to be ordered to detect a very small brain tumor?

Which test will the nurse expect to be ordered to detect a very small brain tumor?

• A. CT scan
• B. Angiography
• C. Electroencephalography (EEG)
• D. Positron emission tomography (PET) scan

Answer: (D)

Detecting very small brain tumors depends on imaging that shows activity, not just structure. A PET scan measures metabolic activity using a radiotracer, so tumor cells with higher metabolism light up as hot spots even when the mass is too small to be seen clearly on other scans. This functional information makes PET particularly sensitive for small lesions, helping to reveal tumors that may be occult on CT. CT scans show anatomy and are great for acute issues and structural detail, but very small tumors can be difficult to distinguish from normal brain tissue on CT because they may not alter density enough to stand out. EEG looks at brain electrical activity and is useful for seizures or other functional disorders, not for locating tumors. Angiography maps blood vessels and is invasive and focused on vessels rather than detecting small masses. Because PET highlights metabolic activity, it’s the best choice among these options for detecting a very small brain tumor, often with anatomical localization provided by a CT or MRI when used together.

Detecting very small brain tumors depends on imaging that shows activity, not just structure. A PET scan measures metabolic activity using a radiotracer, so tumor cells with higher metabolism light up as hot spots even when the mass is too small to be seen clearly on other scans. This functional information makes PET particularly sensitive for small lesions, helping to reveal tumors that may be occult on CT.

CT scans show anatomy and are great for acute issues and structural detail, but very small tumors can be difficult to distinguish from normal brain tissue on CT because they may not alter density enough to stand out. EEG looks at brain electrical activity and is useful for seizures or other functional disorders, not for locating tumors. Angiography maps blood vessels and is invasive and focused on vessels rather than detecting small masses.

Because PET highlights metabolic activity, it’s the best choice among these options for detecting a very small brain tumor, often with anatomical localization provided by a CT or MRI when used together.