Most common solid renal mass in infants
The most common solid renal mass in infants is fetal renal hamartoma, also known as mesoblastic nephroma. Infants usually present with a palpable renal mass. Hematuria, hypertension, and hypercalcemia may also be present. The tumor is composed of monotonous sheets of spindle-shaped cells and usually occupies most of the kidney. The tumor appears large and solid on US. The mass is usually resected, and the prognosis is excellent. Less common causes of solitary renal masses in infants include nephroblastomatosis and malignant rhabdoid tumor.