[Recommendation for the classification of male hypogonadism]

For the adequate therapy and prognosis the division of the forms of male hypogonadism is of practical significance. The clinical picture is determined by 4 factors (dimensions): 1. On the basis of the vertical dimension hypogonadism can be hypothalamic, hypophyseal, testicular or peripheral in its origin; 2. Depending on the impaired testicular functions (single or both), hypogonadism can be selective or total; 3. Depending on the severity of the lesion hypogonadism can be complete or incomplete; 4. the time-factor indicates the beginning of the lesion (pre- or postpuberal). The duration of the lesion is also of clinical significance. For the division of male hypogonadism, two etiopathogenetical groups can be suggested: Group I: "Classical" male hypogonadism. Hypothalamus-hypophysis-testis system primarily damaged; Group II: "Consecutive" male hypogonadism. Hypogonadism induced by other diseases.