The Authors present 362 cases of hypospadias, during 10 years, considering genetical aspects of the malformation. The mean frequency rate of hypospadias is 0.32%. In 60 of the examined patients (17.1%) there was another subject with hypospadias and in 12 cases (4.3%) there was a third subject with the malformation. In 32 cases (9.1%) the relationship was between brothers and in 15 cases (4.2%) the fathers were concerned. Thus, each group had a clean increasing risk in comparison with the mean frequency rate. From the analysis of the results appears a not mendelian inheritance and not even sex linked or single locus linked, in the transmission of the characters. The Authors emphasize the role of some hereditary predisposition in concomitance of environmental conditions, to date not well known. The hypospadias, thus, to fit in the "mid-line pathology", a recent chapter of genetics, characterized by a lack of coalescence, just in the mid-line of embryonal development, during organogenesis.