SummaryWe report the case of a 74-year-old-man, who developed severe progressively increasing dyspnea, during the 24 hours following a staging bipedal lymphography for non-Hodgkin lymphoma.The diagnosis of pulmonary thromboembolism has been established.The authors discuss the differential diagnosis with pulmonary oil embolism and suggest periodically passive exercise of the legs during lymphography in patients with high risk of venous thromboembolism, or even prophylactic heparinisation during the procedure in certain cases with extensive compression on larger veins.