Streptococcus equi subsp. zooepidemicus and 'Neighbourhood syndrome' -extra-orbitocranial rhinosinusitis with reversible sudden loss of vision- a case report.

Background: Rhinosinusitis is a common condition which may present with complications commonly involving the orbit and the intracranial space. Loss of vision in the absence of clinical or radiological signs of involvement of the orbit and intracranium is rare and carries a high morbidity rate. Streptococcus equi subspecies zooepidemicus is not a well-documented cause of paranasal sinus infection.