Bladder nephrogenic adenoma as a complication of surgical correction of megaureter

Abstract Background Bladder nephrogenic adenoma (BNA) is a rare benign proliferative pathology of its mucosa. The etiopathogenesis of the disease remains uncertain, and the treatment is still challenging. Case presentation In this article, we present a clinical case of bladder nephrogenic adenoma in a 6-year-old boy. Clinical symptoms of the disease appeared 3 years after surgical treatment of obstructive megaureter. Histopathological and immunohistochemical examination of glandular polyp biopsies allowed excluding the tumor process and making a diagnosis. Conclusion Nephrogenic adenomas demonstrate a variety of morphologic patterns that may occasionally be confused with malignant processes. We described the endoscopic characteristics of BNA and characterized its histological and immunohistochemical features in a boy after ureteroneocystostomy.