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
Case of 30 year chronic smoker male, visited your clinic with this condition. Diagnosis: 
Select and explain. 
A. Diabetic gangrene, B. Buerger's disease, C. Atherosclerotic plaque, D. Clostridium welchii infection
B: Buerger's disease
Answer: B: Buerger's disease 
Explanation: Ans. (b) Buerger's disease.Buerger's disease is also known as thromboangiitis obliterans. An inflammatory and obliterative disease of blood vessels of the extremities, mainly lower extremities. Occurring chiefly in smoker young men and leading to ischemia of the tissues and gangrene. Involvement of artery vein and nerve, most commonly involved is tibial artery. Intermittent claudication, pain at rest relieved by dangling legs. Dry gangrene in toes shows shriveled woody induration.IOC: Duplex USG (ankle brachial index: 0.5 to 0.9)Treatment: For Claudication pain, reducing the viscosity of blood pentoxifylline is used. For resting pain, lumbar sympathectomy. If gangrene, amputation done.Image source- style="font-family: Times New Roman, Times, serif">