Chromosome 11 Ring: Caused by a break of the long and
short arms of chromosome 11. It is characterized by failure to thrive,
psychomotor retardation, craniofacial anomalies (e.g., microbrachycephaly,
short nose with a low, depressed nasal bridge, microretrognathism, low-set
ears), ocular abnormalities, a short neck, pancytopenia, and congenital
heart defects. The exact cause of chromosome 11 ring is not fully
understood.