Coexistence of Charcot-Marie-Tooth disease type 1A and anti-MAG neuropathy

Giuseppe Piscosquito, Ettore Salsano, Claudia Ciano, Luisa Palamara, Michela Morbin, Davide Pareyson

Research output: Contribution to journalArticlepeer-review


At age 35, a man with a genetic diagnosis of Charcot-Marie-Tooth disease type 1A (CMT1A) but no family history of neuropathy and no clinical symptoms developed rapidly progressive loss of balance, distal limb numbness, loss of manual dexterity, and hand tremor. Five years later, he walked with support and had mild pes cavus, marked sensory ataxia, severe leg and hand weakness, absent deep tendon reflexes (DTRs), severe sensory loss, and hand tremor. He had dramatically reduced motor nerve conduction velocity (MNCV), strikingly prolonged motor distal latencies, absent sensory action potentials and lower limb compound muscle action potentials. CMT1A duplication was reconfirmed but the dramatic change in his clinical course suggested a superimposed acquired neuropathy. An IgM-kappa monoclonal gammopathy of uncertain significance (MGUS) with high titer anti-myelin associated glycoprotein (anti-MAG) activity was found. Nerve biopsy showed severe loss of myelinated fibers with onion bulbs, no evidence of uncompacted myelin, and few IgM deposits. Rituximab was given and he improved. It is very likely that this is a chance association of two rare and slowly progressive neuropathies; rapidly worsening course may have been due to a "double hit". Interestingly, there are reports of possible superimposition of dysimmune neuropathies on hereditary ones, and the influence of the immune system on inherited neuropathies is matter for debate.

Original languageEnglish
Pages (from-to)185-188
Number of pages4
JournalJournal of the Peripheral Nervous System
Issue number2
Publication statusPublished - Jun 2013


  • anti-MAG neuropathy
  • autoimmune neuropathy
  • Charcot-Marie-Tooth
  • CMT1A
  • peripheral neuropathy

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)


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