Importance: Persistent radiation-induced alopecia (pRIA) and its management have not been systematically described.
Objective: To characterize pRIA in patients with primary central nervous system (CNS) tumors or head and neck sarcoma.
Design, Setting, And Participants: A retrospective cohort study of patients from January 1, 2011, to January 30, 2019, was conducted at 2 large tertiary care hospitals and comprehensive cancer centers.