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Updated: May 28, 2026

Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons
Published on: May 25, 2015
[Neuralgic amyotrophy revealed by diaphragmatic palsy]
M Grini-Mazouzi1, R Juntas Morales
1Service de neurologie hospitalisation complète, hôpital Gui-de-Chauliac, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France. magda.grini@free.fr
Introduction:
Neuralgic amyotrophy is considered to be a form of mononeuropathy multiplex which generally involves the nerves of the upper limbs.
Observations:
We describe four cases of neuralgic amyotrophy revealed by dyspnea due to phrenic nerve involvement, with asymptomatic motor deficit in the upper part of the brachial plexus.
Conclusion:
Phrenic nerve involvement revealed by dyspnea is rare. Associated with neurologic signs, the diagnosis is evocative. In case of an isolated attack, the key to diagnosis is the electromyographic exam.
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