Figure 1: 3D time of flight magnetic resonance angiograms taken from a 2 year old previously healthy child who presented with an acute left hemiparesis. No other AIS risk factors were identified and he had never had chickenpox. The acute study (a) shows reduction in flow in the M1 segment of the right middle cerebral artery, with preservation in the distal filling. These radiological features would be compatible with transient cerebral arteriopathy (TCA). After 15 months (b) the arteriopathy had resolved, thus remaining consistent with the diagnosis of TCA.