Q. You are working in the pediatric clinic. A mother brings her infant in for a routine exam and says that she has noticed something "funny looking" about the child's lower back. You lay the child on her stomach so you can inspect her back. Indeed, there is a circumscribed, area of excessive hair growth (hypertrichosis) in the lumbosacral region in midline on her back. You identify that this is a faun tail nevus. What should you be concerned about with this child?