Fig. 5From: An overview of the findings of dynamic upper limbs’ arterial and venous duplex in cases of vascular thoracic outlet syndromea–d Ultrasound images showing significant stenosis of the compressed vein segment at the costo-clavicular tunnel as evidenced by significant rise in the velocity ratio > 6.5 (13 cm/sec in neutral position seen in a reaching (90cm/sec in arm abduction and external rotation seen in b. c Color image for the axillary vein in the resting position but with abduction and external rotation (ABER) almost total cessation of flow was noted in d with peaked narrowing at the costo-clavicular outlet (white arrow)Back to article page