What is CT?
Computerised tomography is a type of x-ray, in which scans from different directions are merged to produce slices or 3-D images.
What is the main indication of CT?
CT is useful in locating tumors detected by PET scanning, showing where they are in the body.
In patients with skin melanoma, CT is not considered useful for patients whose tumor has not spread to lymph nodes (glands) or other parts of the body (Khansur, Sanders and Das 1989). One study suggests that CT is unhelpful even if the tumor has spread to regional lymph nodes (Kuvshinoff, Kurtz, and Coit, 1997).
What are the dangers of CT?
CT exposes the patient to radiation, which can be harmful.
CT scans can give rise to false positive results, causing unnecessary stress and investigations.