nephrogenic adenofibroma A benign, solitary, and partially cystic neoplasm arising from the kidney. It occurs in children and adults. Presenting symptoms include hematuria and polycythemia. It is characterized by the presence of epithelial nodules embedded in a stroma containing spindle cells. DOID:2698 ICDO:8965/0 MONDO:0002396 NCIT:C39812 UMLS:C1266141 metanephric adenofibroma kidney benign neoplasm fibroepithelial neoplasm