Lateral sinus thrombosis is a rare complication of mastoiditis. It occurs mainly in children, although adults have been known to develop it as well. People with lateral sinus thrombosis often have a severe fever, vomiting, and a headache. They may complain of double vision and other visual disturbances. CT or MRI scans diagnose the condition. A lack of fluid flow in the sinuses of the brain is the main sign that a person has lateral sinus thrombosis. The condition requires prompt treatment with antibiotics.

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