NF1 and infection: In the unilateral FCA group, we had two (10.5%) patients with Moyamoya disease (one also having NF-1), four (21.1%) with FCA-I (two associated with varicella-virus infection (Figure 3), one with tuberculous meningitis and one with presumed infection of unknown cause), and one (5.4%) with radiation arteriopathy (history of medulloblastoma).