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Presence of pericentric inversion in chromosome 9 in all family members

Pericentric inversion is the most common type of inversion encountered in human beings. Although pericentric inversion in chromosome 9 is generally considered as normal variant without any phenotypic presentations, some conditions associated with it, like mental retardation. In the present case, we discuss a baby with mental retardation showing pericentric inversion of chromosome 9 and also parents showing the same type of inversion on chromosome 9 without any phenotypic presentations.