A female with a de novo tandem duplication of 9q22.2-q31.1 is presented. Molecular delineation of the breakpoints was made by microarray CGH and fluorescent in situ hybridisation. Involvement of 9q22.2-q31.1 seems to be sufficient. to produce the characteristic phenotype of partial trisomy 9q syndrome. A discussion on the recognizable clinical features of the condition is presented.