Compression of the subclavian vein between the first rib and clavicle was confirmed on CT, and the DVT was redemonstrated and located immediately distal to this compression. Furthermore, the subclavian artery was compressed at the same location as the vein confirming a rare diagnosis of arterial thoracic outlet syndrome (aTOS) with venous thoracic outlet syndrome (vTOS) complicated by upper limb deep venous thrombosis (DVT) and resultant pulmonary embolism (PE).