Answer:
Cerebral thrombosis
Step-by-step explanation:
Cerebral thrombosis or cerebral venous sinus thrombosis (CVST) is a situation whereby there is a blood clot in the dural venous sinuses which causes blood to drain out of the brain.
Some of the symptoms of cerebral thrombosis include abnormal vision, headache, including stroke symptoms like garbled speech, headache, weakness, seizures, and among others.
Therefore, the complication of polycythemia that could most likely be associated with the client's death is cerebral thrombosis.