Duplication of 5q11.2----q13.1 from a familial (5;20) balanced insertion

A 2-year-old boy with gross motor delay and few minor anomalies has a pure duplication of a small segment of chromosome 5q11.2----q13.1. A balanced insertion of this 5q segment into chromosome 20q proximal to the centromere has been found in his father, uncle, and paternal grandmother.