Table 1.

Simplified Edinburgh criteria

	Subarachnoid hemorrhage	Fingerlike projections
High risk	+	+
Medium risk	+–	–+
Low risk	–	–

The simplified Edinburgh criteria are based on analysis of the non-contrast CT. (Rodrigues et al., 2018) In the original study, (Rodrigues et al., 2018) no patients had fingerlike projections in isolation, but given the association between CAA and fingerlike projections, fingerlike projections in isolation were (in line with previous studies) (Schwarz et al., 2022, Sembill et al., 2022) categorized as medium risk.