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How is a CT scan used to diagnose retinoblastoma?

CT scans can be used to detect retinoblastoma, especially if it has spread to nearby (or distant) areas outside the eye. The CT scan is a form of x-ray. While a regular x-ray usually involves taking one or several pictures from a certain angle, the CT scanner moves around the body to take several images. The patient lies on a table, and may have some dye injected to increase the visibility of abnormal tissue. Spiral CT scanners have made the process even easier and more efficient.

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