A great deal is now known about neurofibromatosis type 1, particularly as a result of the identification of its causative gene by positional cloning. However, effective treatments for its resulting cosmetic disfigurement, impaired cognitive performance and even life-threatening malignancy remain elusive. As Dr. Korf remarks in his Foreword: "this book's cogent and thorough description of neurofibromatosis in children will take its place alongside other major clinical studies of the disorder. Dr. North] has tackled some of the more challenging issues, such as the basis for learning...