This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral Arterial Occlusive Disease, Subject name: Surgery
Adson test is used for determining vascular suffiency. It is useful in - 
Select and explain. 
A. Peripheral vascular disease, B. Varicose veins, C. Cervical rib, D. AV fistula
C: Cervical rib
Answer: C: Cervical rib 
Explanation: Ans. is 'c' i.e., Cervical rib. Adson test -It is a prorocative test for thoracic outlet syndrome. This test is positive in cases of compression of subclavian artery as noted by a radial pulse deficit when patient is placed in positions provoking compression of subclavian artery by a cervical rib or tightehed anterior and middle scalene muscles.