Meningitis caused by Enterococcus casseliflavus with refractory cerebrospinal fluid leakage following endoscopic endonasal removal of skull base chondrosarcoma

To the Editor： Meningitis caused by Enterococcus casseliflavus （E. casseliflavus） is extremely rare. Here we report an unusualcase of meningitis caused by E. casseliflavus coexisting with refractory cerebrospinal fluid （CSF） leakage following endoscopic endonasal resection of skull base chondrosarcoma.