How do you approach malignant plexopathy?

In patients with hx of metastatic cancer, presenting with unilateral proximal arm weakness. No checkpoint inhibitors use.
Which CSF labs should we look for?

Answer from: at Community Practice

Typically, in a patient with prior cancer history who develops unilateral flaccid arm weakness, the differential concern is radiation plexopathy (if radiation to that area before, can be years from symptom onset, usually is painless and insidiously progressive) vs malignant infiltration (typically q...

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at UPMC
Excellent

at Columbia University
Also could be paraneoplastic. Look for antibodies ...

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How do you approach malignant plexopathy?

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