Wilms tumor: ultrasonic features, pathologic correlation, and diagnostic pitfalls.

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Abstract
The gray-scale ultrasonic features of Wilms tumor [the most common malignant abdominal tumor in children] are reported with pathologic comparison. The most consistent ultrasonic features are large size, sharp margination and echogenic heterogeneity. The frequently observed anechoic areas correlated with hemorrhage and necrosis. A rare case of mesoblastic nephroma is included for comparison. Pitfalls in diagnosis are discussed.