The most common cause of loss of smell is a cold/flu, or sinus disease. However, in a small number of cases, and in association with other findings such as headache, or an increased prolactin, one should be evaluated for a mass in the frontal lobes or at the base of the brain. Slow growing masses may not cause problems for a long time. Increased prolatin is associated with pituitary gland tumors, which are common, benign (that is, usually not invasive) but grow slowly and can cause compressive symptoms over time to closeby structures like smell and vision. There are several other causes of increased prolactin such as drugs, kidney problems, pregnancy etc, but a pituitary tumor should always be excluded. If present, and it is large enoiugh to warrant removal, it can be done minimally invasively through keyhole surgery via the nose.
An MRI scan is the scan of choice, not a CT scan.
Good luck
Chelan
Sorry to hear about your issue. Earlier this year, I also noticed a markedly diminished sense of taste/smell, which came on suddenly.
Did yours come on suddenly, or was it a gradual thing? Is your sense of smell totally gone or is it diminished?
Take care.
You should talk to your dr about your loss - I never thought that this symptom could be serious. It's always good to be cautious.
Chelan