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</div><div><span>Transillumination</span></div></div>
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</a><h1 class="with-also" itemprop="name">Transillumination</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>Transillumination is the shining of a light through a body area or organ to check for abnormalities.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>The room lights are dimmed or turned off so that the area of the body may be seen more easily. A bright light is then pointed at that area. Areas where this test is used include the: </p><ul><li>Head </li><li><a test="test" href="./002296.htm">Scrotum</a></li><li>Chest of a premature or newborn infant</li><li>Breast of an adult female</li></ul><p>Transillumination is also sometimes used to find blood vessels.</p><p>In some locations in the stomach and intestine, the light can be seen through the skin and tissues at the time of <a test="test" href="./003888.htm">upper endoscopy</a> and <a test="test" href="./003886.htm">colonoscopy</a>.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How to Prepare for the Test</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>No preparation is necessary for this test.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test will Feel</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>There is no discomfort with this test.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Why the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>This test may be done along with other tests to diagnose:</p><ul><li><a test="test" href="./001571.htm">Hydrocephalus</a> in newborns or infants</li><li>Fluid-filled sac in the scrotum (<a test="test" href="./000518.htm">hydrocele</a>) or a tumor in the testicle</li><li>Breast lesions or cysts in women </li></ul><p>In newborns, a bright halogen light may be used to transilluminate the chest cavity if there are signs of a collapsed lung or air around the heart. (Transillumination through the chest is only possible on small newborns.)</p><p>In general, transillumination is not an accurate enough test to rely on. Further tests, such as an <a test="test" href="./003337.htm">x-ray</a>, <a test="test" href="./003330.htm">CT scan</a>, or <a test="test" href="./003336.htm">ultrasound</a>, are needed to confirm the diagnosis.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Normal Results</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>Normal findings depend on the area being evaluated and the normal tissue of that area.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>What Abnormal Results Mean</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>Areas filled with abnormal air or fluid light up when they should not. For example, in a darkened room, the head of a newborn with possible hydrocephalus will light up when this procedure is done.</p><p>When done on the breast:</p><ul><li>Internal areas will be dark to black if there is a lesion and bleeding has occurred (because blood does not transilluminate).</li><li><a test="test" href="./002236.htm">Benign</a> tumors tend to appear red.</li><li>Malignant tumors are brown to black. </li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Risks</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>There are no risks associated with this test.</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/9854t.jpg" alt="Infant brain test" title="Infant brain test" class="side-img"/><a href="../imagepages/9854.htm">Infant brain test</a></li>
</ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Ball JW, Dains JE, Flynn JA, Solomon BS, Stewart RW. Examination techniques and equipment. In: Ball JW, Dains JE, Flynn JA, Solomon BS, Stewart RW, eds. <em>Seidel's Guide to Physical Examination</em>. 10th ed. St Louis, MO: Elsevier; 2023:chap 3.</p><p>Lissauer T, Hansen A. Physical examination of the newborn. In: Martin RJ, Fanaroff AA, Walsh MC, eds. <em>Fanaroff and Martin's Neonatal-Perinatal Medicine: Diseases of the Fetus and Infant</em>. 11th ed. Philadelphia, PA: Elsevier; 2020:chap 28.</p></div></div></section>
<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 8/20/2023</h2></div><div class="section-button"><button type="submit" aria-controls="section-version" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<div id="section-version" class="section-body"><p>Updated by: Jacob Berman, MD, MPH, Clinical Assistant Professor of Medicine, Division of General Internal Medicine, University of Washington School of Medicine, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. </p>
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