as a Cause of Chronic Meningitis in a 3-Year-Old Boy with Acute Lymphoblastic Leukemia.

is an opportunistic yeast closely related to and an uncommon cause of central nervous system (CNS) infection. While isolates are often susceptible to azoles, reduced susceptibility or acquired resistance may occur, making species identification and antifungal susceptibility testing clinically relevant. We report a 3-year-old boy with Philadelphia chromosome-positive B-cell precursor acute lymphoblastic leukemia (ALL) in hematologic remission who developed chronic meningitis during maintenance chemotherapy. The initial presentation was non-specific (marked somnolence without fever or meningeal signs) and lumbar puncture performed to exclude CNS relapse revealed neutrophil-predominant pleocytosis and elevated protein; the cerebrospinal fluid (CSF) culture grew . Treatment with intravenous liposomal amphotericin B followed by prolonged fluconazole led to clinical improvement and sterile CSF. Six months later, progressive gait disturbance, limb pain, and episodic severe headaches recurred; repeat CSF cultures again yielded , with a changed susceptibility profile. Spine MRI demonstrated leptomeningeal enhancement involving the cauda equina nerve roots. Intravenous voriconazole with therapeutic drug monitoring was initiated and combined with intrathecal liposomal amphotericin B (seven doses, dose-escalated up to 3 mg), which was well tolerated and associated with rapid neurologic improvement, CSF sterilization, and radiologic resolution. At 12 months of follow-up, the patient remained infection-free and in leukemia remission. This case highlights that chronic meningitis may present subtly yet progress, requiring repeated CSF cultures with susceptibility testing; intrathecal liposomal amphotericin B can be a safe and effective adjunct to systemic therapy in refractory or recurrent disease.