Charcot-Marie-Tooth disease type 4B3

Charcot-Marie-Tooth disease type 4B3 (CMT4B3) is a very rare inherited nerve disorder that belongs to the larger family of Charcot-Marie-Tooth diseases, which are among the most common inherited neurological conditions. CMT4B3 specifically affects the peripheral nerves — the nerves that connect your brain and spinal cord to your muscles and sensory organs in your arms and legs. In this condition, the protective covering around nerves (called myelin) does not form properly, which slows down or disrupts nerve signals. People with CMT4B3 typically experience progressive muscle weakness and wasting, especially in the lower legs and feet, and later in the hands. This leads to difficulty walking, foot deformities such as high arches or hammertoes, and problems with balance. Sensation in the hands and feet may also be reduced, making it harder to feel temperature, pain, or touch. The disease tends to begin in childhood and slowly worsens over time. There is currently no cure for CMT4B3. Treatment focuses on managing symptoms and maintaining function. Physical therapy, occupational therapy, orthopedic devices like braces or special shoes, and sometimes surgery for foot deformities are the main approaches. Pain management may also be needed. Research into gene-based therapies and other disease-modifying treatments is ongoing but none are yet approved for this specific subtype.

Bring these to your next appointment

• Q1.How quickly is this condition likely to progress in my case or my child's case?,What medications or substances should we avoid because they can worsen nerve damage?,How often should we have follow-up nerve conduction studies or other monitoring?,What types of physical therapy exercises are most helpful for CMT4B3?,Are there any clinical trials or research studies we could participate in?,When should we consider orthopedic surgery for foot deformities?,Should other family members be tested for this gene mutation?

Common questions about Charcot-Marie-Tooth disease type 4B3