Cerebral Vasculitis due to Invasive Disseminated Streptococcus intermedius Infection in an Immunocompetent Adult

Summary: Acute bacterial sinusitis can be complicated by orbital and intracranial involvement as well as thrombophlebitis, with venous anatomy and primary pathogen virulence playing key roles in its spread. Here, we present a rare case of Streptococcus Intermedius acute bacterial sinusitis complicated by extensive skull base involvement, including cavernous sinuses and neck vein thrombophlebitis and thrombosis.