benign cystic nephroma A benign encapsulated neoplasm of the kidney, characterized by the presence of cysts separated by septa. There are no solid areas present. The septa are lined by one layer of epithelial cells that have eosinophilic or clear cytoplasm. The cystic spaces contain serous or hemorrhagic fluid. DOID:2673 EFO:1000213 ICDO:8959/0 MONDO:0002385 NCIT:C7504 UMLS:C1266138 benign cystic nephroma benign multilocular cystic nephroma cystic nephroma kidney benign neoplasm