An elderly patient with paraneoplastic cutaneous leukocytoclastic vasculitis (CLV) leading to the discovery of an as-yet asymptomatic, potentially surgically curable squamous cell carcinoma of the lung is presented. This type of vasculitis has not been previously described in association with this type of lung cancer. Since vasculitic paraneoplastic syndromes, including CLV, may develop before the clinical presentation of malignant tumors, the present case and others previously reported strongly suggest that in apparently idiopathic CLV, patients should be evaluated for the presence of occult malignancy that could be curable by early detection.
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