Abstract BACKGROUND Despite the high prevalence of headaches in pediatric patients with brain tumors, very little research has been done to characterize their traits and to assess current management practices. Effective and efficient treatment of these headaches is critical to the optimization of brain tumor survivors’ quality of life. Foundational knowledge of any clinical associations likely would be beneficial to develop rational management strategies. METHODS A retrospective single-institution chart review of pediatric patients seen in the Children’s Hospital Colorado (CHCO) Neuro-oncology clinic from 1/1/22-12/31/22 is underway. Information is being collected via manual chart review including basic demographic information, oncologic diagnosis and tumor location, surgical interventions, and tumor-directed treatments. Headache characteristics, including timing of onset, associated symptoms, severity and frequency, referral to CHCO Neurology Headache Clinic and any headache therapies attempted will be sought. Additional information will include the number of emergency department visits and unplanned MRIs obtained as part of headache management. RESULTS 384 patients (53% male; median age 12 years, range 2-24 years) received care in the CHCO Neuro-oncology clinic in 2022. The majority of these patients were Caucasian/Non-Hispanic (61.7%), followed by Caucasian/Hispanic (13.8%) and African American/Non-Hispanic (4.2%). In this cohort, the preferred language for 93% was English and for 6% was Spanish. The majority (55%) of patients had a low-grade glioma/ glioneuronal tumor as their oncologic diagnosis. Patients with referrals to CHCO Headache clinic made up 13% of this cohort. Data collection and analysis are ongoing. CONCLUSIONS This data set will help to characterize the prevalence and features of headaches in pediatric patients with CNS tumors. This information will serve as the foundation for planned prospective studies that will collect more comprehensive and consistent data related to headaches in the pediatric neuro-oncology population and to formalize processes that will identify appropriate patients for referral to specialized headache providers.