Metanephric stromal tumor, a rare pediatric renal neoplasm in Iranian children

Stromal tumors comprise less than 20% of the pediatric renal neoplasms.1 Metanephric stromal tumor (MST) is a very rare pediatric renal mass most occurring during infancy and childhood. Surgical excision of the lesion alone is curative in most patients.2 The correct diagnosis of this benign tumor is important because it saves the patient from side effects of unnecessary chemotherapy or radiation therapy. The most presentation of MST is an abdominal mass. In this report, a MST presented with an asymptomatic mass during vesicourethral reflux (VUR) follow up in a 3 y-old girl.