Metastasis to the brachial plexus is a fairly common complication of breast carcinoma, lung carcinoma, and lymphoma. Metastatic tumor involving the lumbosacral plexus is an increasingly recognized complication of a number of neoplasms. It is important for neurologists to diagnose metastatic brachial plexopathies early and to differentiate them from radiation-induced plexus injury or other etiologies. In this article, the author discusses the clinical presentations, diagnostic issues, and management of patients with metastatic plexopathies.
• Carcinomas of the lung or breast are the most common sources of brachial plexus metastases, whereas lumbosacral plexus metastases most often arise from primary pelvic tumors or from lymphoma.
• Local and/or radicular pain is the most common presenting symptom of nerve plexus metastasis and is eventually followed by motor and sensory deficits.
• Treatment of nerve plexus metastases usually brings about significant pain relief; motor and sensory deficits are less likely to improve.
Historical note and terminology
Tumor metastasis to the brachial or lumbosacral plexus is fairly unusual compared to brain or spine metastases. The clinical features of nerve plexus metastases were first clearly delineated in the 1970s.
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