Synonyms: CMT4B3 | Charcot-Marie-Tooth disease with focally folded myelin
Charcot-Marie-Tooth disease type 4B3 (CMT4B3) is a subtype of Charcot-Marie-Tooth type 4 characterized by a childhood onset of slowly progressing demyelinating sensorimotor neuropathy focally folded myelin sheaths in nerve biopsy reduced nerve conduction velocities (less than 38 m/s) and the typical CMT phenotype (i.e. distal muscle weakness and atrophy and sensory loss).
Data from Orphanet are used to provide information on a disease's name, synonym(s), and overview. Reference: Access aggregated data from Orphanet at Orphadata. Orphadata: Free access data from Orphanet. © INSERM 1999. Available on http://www.orphadata.org. Data version July 2026
Newly diagnosed with
Charcot-Marie-Tooth disease type 4B3?
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Advocacy Organizations
Charcot-Marie-Tooth Association
Our mission … to support the development of new treatments for CMT, to improve the quality of life for people with CMT, and, ultimately, to find a cure. Our vision … a world without CMT. CMTA was started by patients in 1986, and to this day is powered by a community of patients who are engaged in helping carry out and support our mission.
Hereditary Neuropathy Foundation
Hereditary Neuropathy Foundation (HNF) is a non-profit 501(c)3 organization which mission is to increase awareness and accurate diagnosis of Charcot-Marie-Tooth (CMT) and related inherited neuropathies, support patients and families with critical information to improve quality of life, and fund research that will lead to treatments and cures.
Hunters CMT4B3 Research Foundation Inc
Hunters CMT4B3 Research Foundation, a non-profit 501(c)3 public charity, was founded to fund, support and advance research including the development and production of therapeutic treatments for Charcot-Marie-Tooth Disease Type 4B3 (CMT4B3) and other related inherited neuromuscular disorders. The mission of the foundation is to improve public awareness of CMT, advance education, develop gene therap
Uganda Alliance of Patients Organization
Supporting patients to access quality, safe and patient-centered healthcare services.
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Clinical Trials
For a list of clinical trials in this disease area, please click here.