Pediatric Radiology > Genitorinary > Tumors > Mesoblastic Nephroma

Mesoblastic Nephroma

Mesoblastic nephroma is a benign hamartoma of mesenchymal connective tissue. It is the most common solid renal mass in the neonate (Wilms tumor is unusual in the neonate). The mean age of presentation is 3 months with a palpable abdominal mass. Ultrasound demonstrates a large mixed echogenic intrarenal mass. CT demonstrates a large solid renal mass with variable degrees of enhancement. A small percentage of mesoblastic nephromas will be atypical and have malignant characteristics. Because imaging cannot absolutely distinguish a mesoblastic nephroma from a rare early Wilms tumor, surgical excision is necessary.
Mesoblastic nephroma