Mondo Description Formation or presence of a blood clot (thrombus) in the superior sagittal sinus or the inferior sagittal sinus. Sagittal sinus thrombosis can result from infections, hematological disorders, craniocerebral trauma; and neurosurgical procedures. Clinical features are primarily related to the increased intracranial pressure causing headache; nausea; and vomiting. Severe cases can evolve to seizures or coma.