We investigated the epidemiology of pediatric anxiety and distress associated with magnetic resonance imaging procedures (MRIPs). Scores on the State-Trait Anxiety Inventory (Spielberger, Gorsuch, Lushene, Vagg, & Jacobs, 1983) and the State-Trait Anxiety Inventory for Children (Spielberger, Edwards, Lushene, Montuori, & Platzek, 1973), and subjective ratings of distress associated with MRIP were obtained from 55 pediatric oncology patients and their parents. Approximately 30% of children and their parents reported that MRIP produced significant distress. However, parents' ratings of their child's distress were significantly higher than children's self-ratings, and agreement between child and parent pairs was poor. Insertion of an intravenous line was identified as the most aversive component of MRIP by both parents (55%) and children (38%). The selective application of cognitive-behavioral interventions for noninvasive diagnostic procedures is suggested.