Case History A 55 year old male presented to the Acute Medical Unit with a one hour history of pain and swelling of his right leg with resultant inability to weight bear. He denied any preceding history of trauma. Previous medical history was unremarkable. He was taking no regular medications, and did not use recreational drugs. There was no prior weight change, or alteration in bowel habit, no associated chest pain or dyspnoea and there were no risk factors for venous thromboembolism or arterial thrombotic disease. He was a lifelong non-smoker. [download-attachments container="div" style="list" display_icon="1" display_count="1" display__size="0"]