An unusual cause of bilateral deep vein thrombosis in a young adult patient.

We describe the case of a 17 year old male who presented with severe groin pain leading to inability to weight bear on his left leg. Investigation revealed extensive bilateral and proximal deep vein thrombosis, in association with an absent inferior vena cava and anomalous venous drainage system. We present a review of the literature surrounding this association, summarise the typical clinical presentation and common characteristics in this group of patients and discuss its management.