A 5-year-old girl with Klippel-Feil anomaly and bimanual polydactyly of triphalangeal thumb is described. The main findings include – in addition to the classical congenital fusion of cervical vertebrae and the clinical triad of short neck, limitation of head and neck movement and low-set posterior hairline – several associated abnormalities: scoliosis, spina bifida occulta, absence of ribs, conductive hearing loss, mirror movements, unilateral renal ectopia with dilation of the collecting system, and microtia. The hand malformation appears to represent a previously unreported defect associated with Klippel-Feil anom