Extrarenal nodular nephrogenic blastema in inguinal canal: a report of twocases

Two observations of extrarenal nephrogenic nodule in inguinal canal are rep orted We underline the! difficulties in differential diagnostic with true W ilms' tumor and in sparing these pediatric eases from more aggressive treat ment. The main morphological arguments in favor of non-tumoral nephrogenic nodular remnants are the size of the lesion, the association with a congeni tal inguinal hernia suggesting a congenital abnormality, and the organoid o rganization of blastemic tissue surrounding the cavities fined with a <<hob nail>> epithelium evoking a mesonephrogenic origin.