Robin sequence and a deficiency of the left forearm in a girl with a deletion of chromosome 4q33-qter.

We have investigated a patient with the Robin sequence and a unilateral deficiency of the left forearm. She was found to have a terminal deletion of the long arm of chromosome 4, del(4)(q33). The clinical manifestations of this patient differ from those of 7 previously described patients with a deletion of the same segment.