Presentation, diagnosis, and staging of Wilms tumor
- Murali Chintagumpala, MD
Murali Chintagumpala, MD
- Professor of Pediatric Hematology and Oncology
- Baylor College of Medicine
- Jodi A Muscal, MD
Jodi A Muscal, MD
- Assistant Professor of Pediatric Hematology and Oncology
- Baylor College of Medicine
Wilms tumor is the most common renal malignancy in children with approximately 500 new cases diagnosed in the United States each year . The epidemiology, presentation, diagnosis, and staging of Wilms tumor will be reviewed here. The treatment and outcome of Wilms tumor are discussed separately. (See "Treatment and prognosis of Wilms tumor".)
In the United States, the annual incidence of renal tumors is approximately seven cases per million children younger than 15 years, accounting for five percent of all childhood malignancies (table 1) and approximately 500 new cases per year [1-4]. Wilms tumor is the most common renal malignancy in children <15 years old, accounting for approximately 95 percent of all cases. In contrast, renal cell carcinoma is more common in the 15 to 19-year-old age group .
In the United States, two-thirds of cases of Wilms tumor are diagnosed before five years of age, and 95 percent before 10 years of age . In patients with unilateral involvement, the median age at diagnosis is 43 months in girls and 37 months in boys . Children with bilateral disease are diagnosed at an earlier age (median age, girls at 31 months and boys at 24 months) . Patients with associated congenital anomalies, such as aniridia or genitourinary abnormalities, are also diagnosed at an earlier age .
The risk of developing Wilms tumor varies among ethnic groups, with a greater risk in African-Americans and a lower risk in the Asian population [3,6-8]. Epigenetic differences may contribute to the lower rate of disease in Asian children, as demonstrated by a study that reported infrequent loss of IGF2 imprinting in tumors from Asian patients . (See 'Genetics' below.)
ASSOCIATED CONGENITAL SYNDROMES
Wilms tumor is primarily a sporadic disease, and only 1 to 2 percent of individuals with Wilms tumor have a relative with the disease . In approximately 10 percent of cases, Wilms tumor occurs as a part of a multiple malformation syndrome, including WAGR, Denys-Drash, and Beckwith-Wiedemann syndromes .To continue reading this article, you must log in with your personal, hospital, or group practice subscription. For more information on subscription options, click below on the option that best describes you:
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- ASSOCIATED CONGENITAL SYNDROMES
- WAGR syndrome
- Denys-Drash syndrome
- Beckwith-Wiedemann syndrome
- Other congenital anomalies
- CLINICAL PRESENTATION
- DIAGNOSTIC EVALUATION
- Abdominal imaging
- Chest imaging
- Laboratory testing
- DIFFERENTIAL DIAGNOSIS
- NWTS system
- SIOP staging