Clinical characteristics of hypertrophic cranial pachymeningitis in granulomatosis with polyangiitis: a retrospective single-center study in China.

"Declarations Ethics approval and consent to participateThe study protocol was approved by the Ethics Committee of Peking Union Medical College Hospital. The trial was conducted by the protocol and the provisions outlined in the Declaration of Helsinki. Because a review of medical records was performed for clinical purposes, the requirement for written informed consent was waived. Consent for publicationAll authors have agreed to publish. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This study was supported by National Key Research and Development Program of China (2018YFE0207300), CAMS Innovation Fund for Medical Sciences (CIFMS) (Grant Number 2021-I2M-1-005), Non-profit Central Research Institute Fund of Chinese Academy of Medical Science (Grant Number 2019XK320022), National Natural Science Fund (Grant Numbers 81771764, 81501414), and Capital Health Development Research Special Fund (Grant Number 2016-4-40111)."