[Significance of family photographs for genetic counseling in sex-linked heredity].

Authors remember the interest of the old photographs belonging to the families; the authors show how they can help the diagnosis; they can also help to assert the mode of inheritance; in few cases, they can find some female carriers with clinical signs; at last, infrequently, they prove the presence of the disease in a remote generation: so, they prove that the one case is not sporadic but is a familial case; this fact is very important for the genetic counselling of the females of this family. With some cases of the genetic counselling unit of Rennes, authors explain these various situations.