Suggested procedure for renal sonography in children at risk of Wilms’s tumour
| Equipment | High-resolution probes and paediatric settings. Linear (7–10 MHz) in infants, curvilinear (6–8 MHz) probe in toddlers |
| Preparation | Fasting and bladder preparation are not required |
| Target organ | Kidney only |
| Technique | Appropriate focal point and time gain settings. The whole renal parenchyma should be imaged longitudinally and transaxially with the child both supine and prone |
| Normal variants | Dromedary hump, column of Bertin, duplex or bifid collecting systems |
| Suspicious lesions | Solitary or multiple cystic or solid parenchymal lesions with or without sonographic signs of expansile growth. A solid lesion with internal vascular flow is more likely to represent malignancy than a simple cystic anechoic lesion |