Acute hydrocephalus caused by cerebellar abscess in HIV-negative castleman's disease

: Castleman's disease (CD) is a rare and indolent hematologic disorder characterized by solitary bulky adenopathy. Multiple nodal nonbulky localizations are described, while central nervous system involvement is rare. Immunodeficiency is associated with higher incidence of CD, and HIV serology should be performed at initial diagnosis. We report the case of a 64-year-old HIV-negative man affected by CD, presenting with acute hydrocephalus caused by a large cerebellar abscess.