Greenwood Genetic Center, Columbia, SC 29209, USA. simensen@ggc.org
We report developmental data on a patient prenatally diagnosed with mosaic trisomy 16. At age six years her intellectual functioning, academic achievement, and adaptive behavior are normal. The myriad of findings among cases prenatally diagnosed with mosaic trisomy 16 are discussed. The diagnosis presents a dilemma for genetic counselors and clinicians.