Final answer:
Untreated pseudotumor cerebri can lead to blindness due to continuous pressure on the optic nerve causing swelling and potential permanent vision loss.
Step-by-step explanation:
Untreated pseudotumor cerebri can result in a number of serious complications. Based on the symptoms provided, we can rule out seizures, hearing loss, and cognitive decline as these are not direct effects associated with pseudotumor cerebri. Instead, this condition is known for affecting vision due to increased pressure within the skull that can compress the optic nerve. The correct answer, therefore, is c) Blindness. If pseudotumor cerebri is not treated, the continuous pressure on the optic nerve can lead to swelling, which may result in progressive and permanent vision loss. It's crucial to treat pseudotumor cerebri promptly to avoid this and other potential complications.