CT scan for melanoma: what to know

CT uses X-rays to create detailed images of the body. For melanoma, clinicians may examine areas such as the chest, abdomen or pelvis when the examination, biopsy findings or symptoms raise concern about spread. A contrast liquid may make tissues easier to distinguish; tell the imaging team about allergies, kidney problems or a possible pregnancy before the scan.

A CT scan does not replace examination of a changing mole or testing a removed skin lesion. The result is interpreted alongside the melanoma stage, pathology and examination. Imaging findings can lead to further tests rather than providing the whole answer at once.

Follow the imaging centre's instructions about eating, drinking and medicines. Wear comfortable clothing and remove metal objects when asked. During the scan, remain still and report warmth, itching or breathing difficulty after contrast. Keep the appointment where the clinician explains the report and how it affects the next step, which may include surgery, a sentinel lymph node biopsy, surveillance or drug treatment.

Contact your melanoma team promptly for new severe headache, weakness, confusion, seizures, breathlessness, persistent vomiting or rapidly worsening pain. These symptoms need assessment because melanoma can affect organs away from the original skin site, including the brain, but they do not by themselves establish the cause.

Ask which body areas the CT will examine, whether contrast is planned, what preparation is needed, when results will be discussed and how the findings could change surgery, medicines or follow-up.