Constriction band syndrome represents a sporadic condition that may result in amputations, constrictions and other deformities of the fetal limbs and body. Prenatal diagnosis by two‐dimensional ultrasound has been reported. We present a case of constriction band involving the upper arm in which the assessment by three‐dimensional ultrasound significantly contributed to the diagnosis and the multidisciplinary counseling. In fact, multiplanar imaging and surface rendering allowed a clear depiction of the extent of the constriction, the club‐hand deformity and the relationship between the amniotic band, the cord and the fetal limb. This case represents a unique and effective application of three‐dimensional ultrasound in prenatal diagnosis. Copyright © 2004 ISUOG. Published by John Wiley & Sons, Ltd.