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</div><div><span>Wilms tumor</span></div></div>
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</noscript></div><div class="main"><div id="ency_summary"><p>Wilms tumor (WT) is a type of kidney cancer that occurs in children.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>Causes</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>WT is the most common form of childhood kidney cancer. The exact cause of this tumor is unknown in most children.</p><p>A missing iris of the eye (aniridia) is a birth defect that is sometimes associated with WT. Other birth defects linked to this type of kidney cancer include certain urinary tract problems and enlargement of one side of the body, a condition called <a test="test" href="./001186.htm">hemihypertrophy</a>.</p><p>It is more common among some siblings and twins, which suggests a possible genetic cause.</p><p>The disease occurs most often in children about 3 years old. More than 90% of cases are diagnosed before 10 years of age. In rare cases, it is seen in children older than 15 years of age, and in adults.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Symptoms</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>Symptoms may include any of the following:</p><ul><li>Abdominal pain</li><li><a test="test" href="./003139.htm">Abnormal urine color</a></li><li><a test="test" href="./003125.htm">Constipation</a></li><li>Fever</li><li>General discomfort or uneasiness (<a test="test" href="./003089.htm">malaise</a>)</li><li>High blood pressure</li><li>Increased growth on only one side of the body</li><li>Loss of appetite</li><li>Nausea and vomiting</li><li>Swelling in the abdomen (<a test="test" href="./003277.htm">abdominal hernia or mass</a>)</li><li>Sweating (at night)</li><li>Blood in urine (<a test="test" href="./003138.htm">hematuria</a>)</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Exams and Tests</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>Your health care provider will perform a physical exam and ask questions about your child's symptoms and medical history. You will be asked if you have a family history of <a test="test" href="./001289.htm">cancer</a>.</p><p>A <a test="test" href="./002274.htm">physical exam</a> may show an <a test="test" href="./003274.htm">abdominal mass</a>. High blood pressure may also be present.</p><p>Tests include:</p><ul><li><a test="test" href="./003777.htm">Abdominal ultrasound</a></li><li><a test="test" href="./003815.htm">Abdominal x-ray</a></li><li><a test="test" href="./003474.htm">BUN</a></li><li><a test="test" href="./003804.htm">Chest x-ray</a> or CT scan</li><li><a test="test" href="./003642.htm">Complete blood count</a> (CBC), may show <a test="test" href="./000560.htm">anemia</a></li><li><a test="test" href="./003475.htm">Creatinine</a> (serum and urine)</li><li><a test="test" href="./003611.htm">Creatinine clearance</a></li><li><a test="test" href="./003789.htm">CT scan of the abdomen</a> with contrast</li><li><a test="test" href="./003335.htm">MRI</a></li><li><a test="test" href="./003782.htm">Intravenous pyelogram</a></li><li><a test="test" href="./007269.htm">MR angiography</a> (MRA)</li><li><a test="test" href="./003579.htm">Urinalysis</a></li><li>Liver function test (transaminases, alkaline phosphatase)</li><li><a test="test" href="./003477.htm">Calcium</a></li></ul><p>Other tests needed to determine if the tumor has spread may include:</p><ul><li><a test="test" href="./007669.htm">Echocardiogram</a></li><li><a test="test" href="./003824.htm">Lung scan</a></li><li><a test="test" href="./003827.htm">PET scan</a></li><li><a test="test" href="./003416.htm">Biopsy</a></li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Treatment</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>If your child is diagnosed with WT, do not prod or push on the child's belly area. Use care during bathing and handling to avoid injury to the tumor site.</p><p>The first step in treatment is to stage the tumor. Staging helps the provider determine how far the cancer has spread and to plan for the best treatment. Surgery to remove the tumor is planned as soon as possible. Surrounding tissues and organs may also need to be removed if the tumor has spread. </p><p><a test="test" href="./001918.htm">Radiation therapy</a> and <a test="test" href="./002324.htm">chemotherapy</a> will often be started after surgery, depending on the stage of the tumor.</p><p>Chemotherapy given before the surgery is also effective in preventing complications.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Outlook (Prognosis)</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>Children whose tumor has not spread have a 90% cure rate with appropriate treatment. Prognosis is also better in children younger than 2 years of age.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Possible Complications</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>The tumor may become quite large, but usually remains self-enclosed. The spread of the tumor to the lungs, lymph nodes, liver, bone, or brain is the most worrisome complication.</p><p>High blood pressure and <a test="test" href="./001065.htm">kidney damage</a> may occur as the result of the tumor or its treatment.</p><p>Removal of WT from both kidneys may affect kidney function.</p><p>Other possible complications of the long-term treatment of WT may include:</p><ul><li><a test="test" href="./007698.htm">Heart failure</a></li><li>Secondary cancer elsewhere in the body that develops after the treatment of first cancer</li><li>Short height</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>When to Contact a Medical Professional</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>Contact your child's provider if:</p><ul><li>You discover a lump in your child's abdomen, blood in the urine, or other symptoms of WT.</li><li>Your child is being treated for this condition and symptoms get worse or new symptoms develop, mainly cough, chest pain, weight loss, or persistent fevers.</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Prevention</h2></div><div class="section-button"><button type="submit" aria-controls="section-8" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-8"><p>For children with a known high risk for WT, screening using ultrasound of the kidneys or prenatal genetic analysis may be suggested.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>Nephroblastoma; Kidney tumor - Wilms</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/1101t.jpg" alt="Kidney anatomy" title="Kidney anatomy" class="side-img"/><a href="../imagepages/1101.htm">Kidney anatomy</a></li>
<li><img src="//medlineplus.gov/ency/images/ency/tnails/9056t.jpg" alt="Wilms tumor" title="Wilms tumor" class="side-img"/><a href="../imagepages/9056.htm">Wilms tumor</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>National Cancer Institute website. Wilms tumor and other childhood kidney tumors treatment (PDQ) - health professional version. <a href="https://www.cancer.gov/types/kidney/hp/wilms-treatment-pdq" target="_blank">www.cancer.gov/types/kidney/hp/wilms-treatment-pdq</a>. Updated October 15, 2024. Accessed December 4, 2024.</p><p>Ritchey ML, Cost NG, Shamberger RC. Pediatric urologic oncology: renal and adrenal. In: Partin AW, Dmochowski RR, Kavoussi LR, Peters CA, eds. <em>Campbell-Walsh-Wein Urology</em>. 12th ed. Philadelphia, PA: Elsevier; 2021:chap 53.</p><p>Weiss RH, Jaimes EA, Hu SL. Kidney cancer. In: Yu ASL, Chertow GM, Luyckx VA, Marsden PA, Skorecki K, Taal MW, eds. <em>Brenner and Rector's The Kidney</em>. 11th ed. Philadelphia, PA: Elsevier; 2020:chap 41.</p></div></div></section>
<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 6/17/2024</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: Todd Gersten, MD, Hematology/Oncology, Florida Cancer Specialists &amp; Research Institute, Wellington, FL. Review provided by VeriMed Healthcare Network. 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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