Classification of Corkscrew Collaterals in Thromboangiitis Obliterans (Buerger's Disease) – Relationship Between Corkscrew Type and Prevalence of Ischemic Ulcers –

摘要

Background: ?A corkscrew collateral appearance on angiography is one of the diagnostic criteria for Buerger's disease. The purpose of the present study was to classify the angiographic findings of corkscrew collaterals and to evaluate the relationship between corkscrew collateral type and the severity of Buerger's disease. Methods and Results: ?Corkscrew collaterals were assessed on digital subtraction angiography in lower extremities of 28 patients with Buerger's disease (55 limbs). The corkscrew sign was classified into 4 types by size and pattern as follows: type I, artery diameter >2?mm, large helical sign; type II, diameter >1.5?mm and ≤2?mm, medium helical sign; type III, diameter ≥1?mm and ≤1.5?mm, small helical sign; and type IV, diameter