Endoscopic endonasal resection of a craniopharyngioma in a 23-month-old patient: illustrative case.

backgroundTreatment of pediatric craniopharyngioma requires a multidisciplinary approach to counsel patients and families on the spectrum of treatment options, including biopsy, radiation, and/or resection. Gross-total resection can avoid radiation and its long-term comorbidities. In very young patients, this is of particular importance but is especially challenging because of anatomical considerations. OBSERVATIONS: A 23-month-old boy was found to have a partially calcified and cystic sellar and suprasellar mass. A fully endoscopic endonasal transtuberculum and transsellar approach was performed for gross-total resection of a subdiaphragmatic adamantinomatous craniopharyngioma. Postoperatively, the patient was diagnosed with panhypopituitarism with diabetes insipidus, though without other hypothalamic dysfunction or new visual deficits. To date, there is no evidence of tumor recurrence. LESSONS: In a high-volume center with an experienced multidisciplinary skull base team, endoscopic endonasal approaches to sellar and suprasellar pathology in children younger than 2 years can be safely performed. A smaller nasal cavity and lack of sinus aeration necessitate wide exposure via bone removal and complete opening of the sinuses to enable an adequate working corridor to perform not only tumor resection but also reconstruction. Safe gross-total resection can avoid, or at least delay, radiation and its long-term morbidity when performed in a developing child. https://thejns.org/doi/10.3171/CASE24209.