Primary Central Nervous System Histiocytic Sarcoma During Neuromyelitis Optica Spectrum Disorder
Histiocytic sarcoma (HS) is a rare hematopoietic malignancy that is seldom found with primary involvement in the central nervous system (CNS). 1-4 Neuromyelitis optica spectrum disorder (NMOSD) is an autoimmune demyelinating disease characterized by anti-aquaporin-4 antibodies (AQP4-Ab). We report an exceedingly rare c...