Phrenic
nerve palsy has many causes, and can be caused by lesions anywhere along its
course, as it travels from the neck to pierce the diaphragm. The epidemiologywill therefore match that of the underlying etiology. Most of the cases are
idiopathic or even thought to be post viral.
Common causes include: tumors like
bronchogenic carcinoma or neuroblastoma, trauma like post thoracic or neck
surgeries or penetrating injuries, neuromuscular diseases, inflammation, direct
compression from aortic aneurysm or cervical osteophytes, toxins like some
spider or lizard toxins, alcoholic neuropathy, or endocrinal causes like
hypothyroidism or diabetes mellitus (diabetic autonomic neuropathy) which
enhances and exaggerates the effect of the other factors. Read more>>>>>>>>>>>
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