Differentiating Mononeuritis Multiplex from CIDP

Clinical Presentation Patterns

The American College of Neurology suggests that mononeuritis multiplex presents with asymmetric sensory and/or motor deficits affecting multiple individual nerves in a non-contiguous distribution, with pain as a prominent feature, particularly when caused by inflammatory or vasculitic processes 1
Mononeuritis multiplex develops in a stepwise pattern where individual nerves become involved sequentially over time, rather than simultaneously, according to the American Academy of Neurology 2
The asymmetric presentation of mononeuritis multiplex suggests different underlying pathology such as vasculitic neuropathy or inflammatory processes, as stated by the European Academy of Neurology 1
CIDP is characterized by symmetric proximal and distal muscle weakness with motor-dominant manifestation and progresses over more than 2 months, distinguishing it from acute conditions like Guillain-Barré syndrome, as recommended by the American Academy of Neurology 3

Nerve conduction studies in mononeuritis multiplex show focal abnormalities in multiple individual nerves with asymmetric involvement, according to the American Association of Neuromuscular and Electrodiagnostic Medicine 2
Electromyography in mononeuritis multiplex identifies discrete mononeuropathies affecting specific nerve distributions, as stated by the International Federation of Clinical Neurophysiology 2
CIDP shows diffuse abnormalities with relatively uniform involvement of tested nerves, demonstrating evidence of demyelination including prolonged distal latencies, slowed conduction velocities, and conduction block, as recommended by the American Academy of Neurology 3

CIDP typically shows cytoalbuminologic dissociation (elevated protein with normal cell count), while this is not a characteristic feature of mononeuritis multiplex, according to the American Academy of Neurology 3
CSF analysis is recommended when inflammatory demyelinating polyradiculoneuropathy is suspected, as stated by the European Academy of Neurology 2

Mononeuritis multiplex is commonly caused by vasculitis (particularly EGPA, polyarteritis nodosa), requiring ANCA testing and potentially deep skin biopsy, as recommended by the American College of Rheumatology 2
Other causes of mononeuritis multiplex include diabetes, sarcoidosis, and systemic inflammatory disorders, according to the European League Against Rheumatism 4
The presence of eosinophilia, asthma, or systemic vasculitis features suggests EGPA as the underlying cause of mononeuritis multiplex, as stated by the American Thoracic Society 4

Mononeuritis multiplex from vasculitis requires high-dose glucocorticoids combined with cyclophosphamide or other immunosuppressants, as recommended by the American College of Rheumatology 2
CIDP responds well to IVIG, corticosteroids, or plasmapheresis as first-line therapy, according to the American Academy of Neurology 3