Pulmonary Signet-Ring Cell Adenocarcinoma Metastatic to the Skin
Internal malignancies occasionally metastasize to the skin, usually imparting a poor prognosis. In men, pulmonary malignancies are the second most common offending tumor. Roughly, half such lesions are adenocarcinomas. A small subset of pulmonary adenocarcinomas exhibits signet-ring morphology. To date, a cutaneous metastasis arising from a pulmonary signet-ring cell adenocarcinoma has not been reported.