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. 2008 Dec 22;8:51. doi: 10.1186/1471-2377-8-51

Figure 1.

Figure 1

Axial bone window images at the level of the cavernous sinuses for different grades of arterial calcium. LOW CALCIUM SUBGROUP. A: Grade 1: Bilateral grade 1 cavernous carotids. Tangible arterial calcifications. B: Grade 2: Bilateral grade 2 cavernous carotids due to thin scattered calcifications. HIGH CALCIUM SUBGROUP. C: Grade 3: Bilateral grade 3 calcifications. Thick, interrupted on the right and thin confluent on the left. D: Grade 4: Bilateral grade 4 ICAC seen as thick, contiguous calcifications.