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Transillumination tests alone aren’t accurate enough to rely on. Further tests, such as ultrasound, CT, or X-ray, need to be done to confirm the diagnosis.

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A bright halogen light may be used to transilluminate a newborn’s chest cavity if there are signs of air around the heart or a collapsed lung. Transillumination through the chest can only be done on small newborns.‌

‌Clinical Images: “Transillumination test: A bedside aid for differentiating meningocele from myelomeningocele: Point of care testing.”

If you have ocular injuries, transillumination will help the doctor see the extent of your injuries and what to do with them.Â

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The transillumination will indicate you have a spermatocele as opposed to something else. If the spermatocele gets too large, your doctor may suggest surgery to remove it.‌

Transillumination is when a doctor shines a light through a body part to look for abnormalities. It can be done with other tests to diagnose certain conditions.‌

Transillumination is a quick and simple way of finding out if you have various conditions. If doctors see something off, they will order more tests to get a clearer picture of any conditions you may have.

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Normal findings depend on what area of the body you’re looking at. Generally, a body part with a normal result won’t light up under the light.‌

Eye conditions. If you have pigment dispersion syndrome (PDS), the doctor will be able to see how the pigment is breaking free from the iris and deposited on the back of the cornea, which is the outermost part of the eye’s lens.‌

A transillumination test is a way of diagnosing certain conditions. It’s often used along with other procedures and tests to confirm a diagnosis. For instance, transillumination may be used with ultrasound and a biopsy.‌

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The doctor will dim the lights and use a bright light directed towards a specific body part to see what’s underneath the skin. Areas the light is usually used on include:

The light can also be used in some parts of the abdomen to see parts of the intestine and stomach during a colonoscopy and endoscopy.

On the scrotum. If you have a spermatocele in your scrotum, transillumination will reveal the mass is fluid-filled rather than solid. The light will go through the fluid-filled spermatocele, whereas a solid testicle will not transmit much light.‌

If you have a scleral tumor, transillumination will let the doctor see where the borders of the tumor are. Your doctor will also be able to see the extent of the tumor and how far it’s progressed. Transillumination will help the doctor to plan a surgical procedure to get rid of the tumor.

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Areas that are filled with abnormal fluid or air will light up under the light. For instance, the head of a newborn who possibly has hydrocephalus will light up during the transillumination process.‌