A nomogram for the prediction of cerebrovascular disease among patients with brain necrosis after radiotherapy for nasopharyngeal carcinoma

•A nomogram to predict cerebrovascular disease in brain necrosis after radiotherapy.•The nomogram shows favorable discrimination and calibration.•The nomogram is capable to stratify patients into high- and low-risk groups.•This reliable and easy-to-use predictive tool may aid in clinical decision making.