Coexisting Inflammatory and Hereditary Neuropathies: A Review

Area of Science:

• Neurology
• Clinical Neuroscience
• Genetics

Background:

• Concurrent acquired and hereditary neuropathies present diagnostic challenges.
• Distinguishing between chronic inflammatory demyelinating polyneuropathy (CIDP) and Charcot-Marie-Tooth (CMT) disease is crucial for effective management.
• This review focuses on the overlap between CIDP and various forms of CMT.

Purpose of the Study:

• To review cases of concurrent CIDP and CMT, including CMT1A, CMT1B, and CMTX.
• To highlight diagnostic challenges and strategies for identifying dual neuropathy pathology.
• To discuss the role of electrodiagnostic testing and emerging techniques like neuromuscular ultrasound.

Main Methods:

• Review of existing literature on CIDP and CMT overlap.
• Presentation of two new cases of concurrent CIDP and CMT1A.
• Analysis of clinical, electrodiagnostic, cerebrospinal fluid, and nerve biopsy findings.

Main Results:

• Concurrent CIDP and CMT require careful evaluation combining clinical data with diagnostic tests.
• Key indicators for superimposed inflammatory neuropathy include rapid, asymmetric weakness and sensory symptoms.
• Diagnostic support for CIDP included albuminocytologic dissociation (63%), electrodiagnostic demyelination (69% conduction block), biopsy findings (58%), and treatment response (84%).
• CMTX and CIDP overlap showed higher immunotherapy treatment failure, possibly due to misdiagnosis of acquired demyelination features.

Conclusions:

• Accurate diagnosis of concurrent CIDP and CMT is essential for appropriate treatment.
• Electrodiagnostic testing, cerebrospinal fluid analysis, and nerve biopsy are vital supportive tools.
• Neuromuscular ultrasound emerges as a valuable tool for differentiating CIDP from CMT, especially in challenging cases with absent nerve responses.