Diprosopia revisited in light of the recognized role of neural crest cells in facial development.

Objective: The aim of this study is to compare the theory of embryogenesis of the face with human diprosopia. This peculiar form of conjoined twinning is of great interest because 1) only the facial structures are duplicated and 2) almost all cases have a rather monomorphic pattern. The hypothesis is that an initial duplication of the notochord leads to two neural plates and subsequently duplicated neural crests.

Sequential use of clomiphene citrate, human menopausal gonadotropin, and human chorionic gonadotropin in human in vitro fertilization. I. Follicular growth and oocyte suitability.

Sequential treatment with clomiphene citrate, human menopausal gonadotropin, and human chorionic gonadotropin was successfully applied to 149 women in the framework of an in vitro fertilization and embryo transfer program and led to the birth of normal children. An average of 3.5 follicles was promoted at each cycle.

Sequential use of clomiphene citrate, human menopausal gonadotropin, and human chorionic gonadotropin in human in vitro fertilization. II. Study of luteal phase adequacy following aspiration of the preovulatory follicles.

The 88 patients included in the in vitro fertilization program during 113 cycles were submitted to superovulation by sequential use of clomiphene citrate, human menopausal gonadotropin, and human chorionic gonadotropin. No correlation was found between estradiol and progesterone levels during the luteal phase and estradiol on the days preceding administration of human chorionic gonadotropin. Nineteen biopsies of the endometrium were carried out.