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Venous thrombosis is a very rare occurrence in patients with haemophilia A. We report the case of a haemophiliac in whom initially a calf haematoma was suspected, but neither this nor deep venous thrombosis (DVT) could be confirmed on ultrasound scanning. Subsequently, a high segment venous thrombosis was diagnosed by venography in a portion of a duplicated superficial femoral vein. Treatment with factor VIII (FVIII) and low molecular weight heparin led to a successful resolution. The only other case we have been able to find in the literature occurred during FVIII replacement therapy, which was not the situation with our patient.