Pseudarthrosis in the context of NF1 has been reported to occur with lesser frequency in other long bone regions, such as the humerus, radius, ulna, and clavicle. Tumors. Neurologic hamartomatous…

Bone Overgrowth. Disorders of bone growth are fairly common manifestations of neurofibromatosis. They are usually recognized clinically by changes in the overlying soft tissues, with some examples including hemangioma, lymphangioma,…

Over the course of their lifetime, patients with NF1 are at inherently greater risk for developing malignancy as compared with the general population. Some examples of neoplasms seen more frequently…

Neurofibromatosis occurs in 1 in 2,500 to 4,000 persons. It is transmitted as an autosomal dominant trait with close to 100% penetrance. There is also a characteristically high rate (~50%)…

HURLER SYNDROME Hurler syndrome (MPS I-H) has an autosomal recessive inheritance and is caused by a deficiency in α-L-iduronidase. Elevated amounts of dermatan and heparan sulfates are identified due to…

Clinical Manifestations. The condition is usually evident at birth. Although the average birth length is 161/2 inches, adult height varies widely depending in part on the degree of contractures and…

For genetic counseling of the family and patient faced with the choice of reproduction, it is essential to determine the specific diagnosis and mode of inheritance. It is no longer…

Clinical Manifestations. Posterior shortening of the thorax and thoracolumbar lordosis are the major causes of short stature. The neck is short and often nearly immobile, and the head appears to…

Although most cases of spondyloepiphyseal dysplasia tarda have an X-linked recessive mode of inheritance, both autosomal dominant and autosomal recessive forms are also known. This has been mapped to the…

The disorder is an autosomal recessive trait, although there may be other modes of inheritance. Camptomelic dysplasia is in some cases associated with XY sex reversal. The majority of infants…