Urgent Carotid Surgery: Is It Still out of Debate?

Table 2

Nicolaides plaque classification.

Plaque	Morphologic characterization
Type 1	Uniformly echolucent plaque
Type 2	Predominantly echolucent plaques with less than 50% echogenic areas
Type 3	Predominantly echogenic plaques with less than 50% echolucent areas
Type 4	Uniformly echogenic plaques
Type 5	Could not be classified (heavy calcification and acoustic shadows)