Unusual CT perfusion imaging pattern with normal CT angiography due to unintended intra-arterial contrast injection; report of 2 cases

Suspected stroke patients that arrive to the emergency department often start with non–contrast CT head followed immediately by CT perfusion and CT angiography, depending on the clinical suspicion and urgency. We present two cases of a 41-year-old male and 37-year-old female with unusual findings on the CT perfusion andnormal CT angiography study due to unintended intraarterial placement of intravenous cannula. This can give rise to unusual imaging pattern and thus awareness of this possibility can mitigate the diagnostic challenge that it brings up.