Diagnostic Approach to Suspected Wilms Tumor

Initial Investigation

The American College of Radiology recommends ultrasound as the initial imaging modality for evaluating abdominal masses in children with hematuria, as it displays kidney anatomy, size, and position effectively and can screen for structural lesions causing hematuria 1, 2
Ultrasound is highly sensitive, readily available, requires no ionizing radiation, and can be performed without anesthesia or contrast, making it an ideal initial investigation for suspected Wilms tumor 1, 2
The American College of Radiology suggests that ultrasound has a definite role in investigating suspected upper gastrointestinal and renal disease in children and should be considered as the initial imaging modality 1, 2

Ultrasound can detect parenchymal changes of abdominal organs and identify masses, though definitive diagnosis requires detailed radiologic assessment 4
The assessment of the contralateral kidney is an important part of the ultrasound evaluation 1
Evaluation for inferior vena cava involvement is also a critical component of the ultrasound examination 2

The American College of Radiology recommends that chest CT should follow abdominal ultrasound in the diagnostic algorithm, not precede it, to fully evaluate the pulmonary findings and stage the disease 4
The abdominal mass must be characterized first to guide subsequent management, emphasizing the importance of ultrasound as the initial investigation 4
Urgent evaluation with ultrasound is necessary in a child with an abdominal mass and hematuria, and delaying imaging or assuming isolated hematuria requires no imaging can lead to delayed diagnosis and treatment 1, 2