[Pseudohermaphroditism and bisexuality. Apropos of a sex change].

A case of change of sex at the age of twelve is reported in a patient with male pseudohermaphroditism who has been regularly followed-up for ten years after the change. This case exemplifies the maturation and identification problems which arise when the patient is assigned to the wrong sex as a result of organic abnormalities. The doubt concerning sexual identity which appears at the time of birth is instrumental in the child's psychic development and produces both intellectual dullness and libidinal fixation to preoedipal stages.