Key words. Macrodactyly is a rare, nonhereditary and congenital deformity, accounting for about 1% of upper extremity congenital anomalies and affecting approximately 1 in 100,000 live births. Macrodactyly can appear alone (ie, the isolated form) or as part of a congenital deformity syndrome (ie, the syndromic form).

How common is Macrodactyly in the foot?

Macrodactyly is an uncommon condition in which a baby's toes or fingers are abnormally large due to the overgrowth of the underlying bone and soft tissue. The condition is congenital, meaning babies are born with it. Macrodactyly happens more often to hands than feet.

What causes Macrodactyly?

What Causes Macrodactyly? The cause of macrodactyly is unknown. Some believe an abnormal nerve or blood supply in the affected fingers or toes causes the condition. The condition isn't inherited and isn't caused by anything the mother did during pregnancy.