Genetic Counseling for Confined Placental Mosaicism: A Case Report.

New technologies can lead to unforeseen discoveries which in turn can lead to diagnostic and counseling dilemmas. A case which involved confined placental mosaicism for trisomy 16 is presented to illustrate such a situation. While interpreting data and explaining a newly described phenomenon created uncertainties for the genetic counseling team, the patient and her husband were primarily dealing with grief surrounding the loss of a wanted pregnancy. It is important to recognize that the counseling issues may be different for the professionals and the families. Genetic counselors must be cognizant of their own reactions and those of their clients and be prepared to use all of their counseling skills to address these varying needs.