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Arterial spin labeling (ASL) has emerged as a technique for assessing mild traumatic brain injury (mTBI), as it can noninvasively evaluate cerebrovascular physiology. To date, there is substantial variability in methodology and findings of ASL studies of mTBI. While both increased and decreased perfusion are reported after mTBI, more consistency is emerging when perfusion is examined with regard to symptomology. We evaluated 15 teenage athletes two and six weeks after sports-related concussion (SRC group) using pseudo-continuous ASL. We acquired comparison data from 15 matched controls from a single time point. At each time point, we completed whole-brain contrasts to evaluate differences between the SRC group and controls in relative cerebral blood flow (rCBF). Cluster-level findings directed region of interest (ROI) analyses to test for group differences in rCBF across the left dorsal anterior …