PMC5402333_01
(a): Initial DSA shows a 3.5 mm pseudoaneurysm projecting distally from the basilar artery at the apex. (b) Complete spontaneous resolution was observed at 14 days after the initial imaging
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F1
SAH, contained largely within the basilar cisterns, but without clear source of the hemorrhage on CTA. Subsequent digital subtraction angiography (DSA) and digital rotational angiography (DRA) demonstrated a 3.5 mm idiopathic pseudoaneurysm projecting posteriorly from the basilar summit/posterior cerebral artery junction without evidence of arterial dissection [Figure 1a]. Follow-up DSA and DRA 14 days after hemorrhage demonstrated complete resolution of the pseudoaneurysm [Figure 1b].