[Intrafamilial bone marrow donation: the role of the parents].

Bone marrow transplantation (BMT) is the last chance of recovery for some children suffering from malignant hemopathy or congenital blood disease. BMT with related donor radically alters previous family relationships: each member of the nuclear family becomes actively involved. Parents and siblings all undergo HLA typing.

[Paradoxes in adolescence: break and continuity].

The psychopathological studies on adolescence underline the paradoxical behaviours during this period of life. After the analysis of its concept we show in which way the paradox helps to maintain the continuity of psychological life during the crisis. Thus impossible choices which are part of the contradiction in adolescents be avoided.