Fewer than 10: Oligodactyly - Diagnoses and patterns of malformation

Oligodactyly, or the absence of one or more fingers, is a common finding in congenital anomalies of the upper limb. The specific diagnoses associated with oligodactyly can be grouped into several development patterns, each with a spectrum of limb involvement and potential for associated anomalies. These conditions include symbrachydactyly, ulnar dysplasia, amnion disruption sequence, cleft hand, and radial dysplasia. This article reviews the major causes of oligodactyly and presents the etiology, genetics, and spectrum of presentation.