Dysplastic cortical hyperostosis, Kozlowski-Tsuruta type

Dysplastic cortical hyperostosis, Kozlowski-Tsuruta type, is an extremely rare bone disorder first described by Kozlowski and Tsuruta. This condition is characterized by abnormal thickening and overgrowth of the outer layer (cortex) of certain bones, a process known as cortical hyperostosis. The condition primarily affects the skeleton, leading to visible and sometimes painful bony enlargements, particularly of the long bones and skull. Affected individuals may notice hard, bony swellings on their limbs or head, and these changes can sometimes be seen on X-rays even before they become noticeable on the outside. Because this disease is so rare, with only a handful of cases reported in the medical literature, our understanding of its full range of symptoms and long-term outcomes is limited. Symptoms may include bone pain, limb deformity, restricted joint movement, and changes in facial appearance if the skull bones are involved. The condition appears to begin in childhood and may progress over time. There is currently no cure or specific treatment for this condition. Management is supportive and focuses on relieving symptoms such as pain, monitoring bone changes with regular imaging, and addressing any complications like joint stiffness or nerve compression through orthopedic or surgical interventions when needed. A team of specialists, including geneticists, orthopedic surgeons, and radiologists, typically work together to manage care.

Bring these to your next appointment

• Q1.Which bones are currently affected, and how severe are the changes?,How often should we have imaging done to monitor progression?,What pain management options are safest for long-term use?,Are there any activities my child should avoid to protect their bones?,Should we pursue genetic testing, and would it help with diagnosis or family planning?,Are there any clinical trials or research studies we could participate in?,What signs should prompt us to seek urgent medical attention?

Common questions about Dysplastic cortical hyperostosis, Kozlowski-Tsuruta type