A 51-year-old woman underwent craniotomy for removal of a pituitary tumor. At surgery, anomalous tissue was found projecting forward from the anterior angle of the optic chiasm. Termed “the chiasmal spur,” this anomaly has been described previously in 5 patients, all as an incidental finding at autopsy. Our case is the first instance of the chiasmal spur being discovered and photographed intraoperatively.
Washington University School of Medicine (CC), St. Louis, Missouri; and Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University (KT, MZ, SL), Beijing, China.
The authors declare that there are no conflicts of interest in this study. No external funding, apart from the support of the authors' institution, was available for this study.
Address correspondence to Song Lin, MD, Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, No. 6 Tiantanxili, Beijing 100050, China; E-mail: firstname.lastname@example.org