Pituitary neuroendocrine tumor with transsellar anastomosis concomitant with internal carotid artery agenesis: illustrative case.

This first reported case of PitNET associated with unilateral ICA agenesis highlights the critical role of DSA in identifying transsellar anastomosis as the sole vascular supply to the pituitary gland. Precise preservation of the arachnoid plane enabled total resection with intact endocrine function. https://thejns.org/doi/10.3171/CASE25976.