Abstract
Merkel cell carcinoma (MCC) is an aggressive small cell neoplasm of the skin characterized by neuroendocrine differentiation. It most commonly involves the head and neck of elderly Caucasians. We present a patient with MCC of the buttock, who 32 months after primary surgery and 18 months after combined chemoradiotherapy developed retroperitoneal metastases causing inferior vena cava (IVC) compression and lower extremity thrombosis. He received anticoagulants, but died 2 months later. This is the first report of MCC causing IVC compression and iliofemoral venous thrombosis. This case illustrates the precarious natural history of this tumor and the controversies that surround its treatment.
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