Buerger's disease may be classified according to the type and size of corkscrew collaterals present into 4 subtypes: 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 <1 mm, tiny helical sign.
Buerger's disease classification
Takayasu's arteritis classification
Buerger's disease physical examination
Buerger's disease criteria
Buerger's disease MRI
Churg-Strauss syndrome classification
Peripheral arterial disease classification
Buerger's disease CT scan