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Neurofibromatous neuropathy: An ultrastructural study.

Chiara Terracciano1, Christa Pachatz2, Emanuele Rastelli1

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Summary

Plexiform neurofibromas can indicate neurofibromatosis 1 (NF1), even without typical signs. Early detection of associated peripheral neuropathy is crucial for NF1 diagnosis and management.

Keywords:
Electron microscopymorphometric analysisneurofibromatosis type Ineurofibromatous neuropathyplexiform neurofibromas

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Area of Science:

  • Neurology
  • Genetics
  • Pathology

Background:

  • Neurofibromatosis 1 (NF1) is a genetic disorder often associated with plexiform neurofibromas.
  • Peripheral neuropathy is a known complication of NF1, but its histopathological features remain poorly understood.

Observation:

  • A 46-year-old woman presented with bilateral supraclavicular masses and MRI revealed plexiform lesions.
  • Nerve conduction studies indicated a sensory motor polyneuropathy.
  • Sural nerve biopsy showed loss of large myelinated fibers, endoneurial fibrosis, and Schwann cell degradation.

Findings:

  • Histopathological analysis revealed preferential loss of large myelinated fibers and significant endoneurial fibrosis.
  • Schwann cell abnormalities and degradation products suggest impaired Schwann cell-axon communication.
  • These findings indicate axonal atrophy and degeneration independent of direct tumoral infiltration.

Implications:

  • The presence of plexiform neurofibromas alongside peripheral neuropathy strongly suggests NF1, even if clinical criteria are not met.
  • Electrophysiological studies are recommended for asymptomatic patients with plexiform neurofibromas to screen for subclinical neuropathy.
  • This case highlights the importance of recognizing neuropathic changes in NF1 for timely diagnosis and intervention.