What is (are) Buschke Ollendorff syndrome ?
Buschke Ollendorff syndrome (BOS) is a genetic condition of the connective tissue. Common signs and symptoms include non-cancerous skin lumps and spots of increased bone density (which can be seen on X-ray). Some people with BOS have both skin and bone symptoms, while others have one or the other.  Individual cases of BOS have occurred in association with joint pain, hearing disorders (e.g., otosclerosis), congenital spinal stenosis, craniosynostosis, and nail patella syndrome. Symptoms of BOS may begin at any age, but most often present before age 20. BOS is caused by mutations in the LEMD3 gene. The mutation results in a loss of protein (also named LEMD3) that results in the excessive formation of bone tissue. It is not clear how the LEMD3 mutations cause the skin lumps or other features of BOS.  BOS is inherited in an autosomal dominant fashion. Affected members of the same family can have very different symptoms.