Fig. 1
From: Cephalic arch stenosis: an analysis of outcome by type of first intervention
Division of the cephalic arch into four domains in roman numerals (as per Bennett et al. [2]) and proposed modification (in colours). Domains II and III are combined into a single segment. The boundaries of domains I and IV are left unchanged. CAS coding is defined as A (ascending – domain I), B (apex, domains II and III), C (confluence, domain IV). Multidomain involvement is coded as D