The duplication/inversion 15q11 or isodicentric 15 chromosome (inv dup(15) or idic(15)) syndrome is a chromosomal disorder with distinctive clinical findings characterized by early central hypotonia, developmental delay and intellectual deficit, epilepsy, and autistic behavior.

Clinodactyly refers to a bending or curvature of the fifth finger in the radial direction (i.e., towards the 4th finger).