Cavernous Sinus Thrombosis or CST, is the formation of a blood clot in cavernous sinus, which is a cavity at the base of the brain. It functions to drain deoxygenated blood from the brain, which is carried back to the heart by veins. This is a life threatening disease and requires immediate treatment. This is a very rare disease with the number of cases ever reported in medical literature being in hundreds. The condition affects women more than men, and children and young adults more than older adults. Before the medical advancements made in our modern era, the mortality rate of this disease was 100%. Now, it remains at less than 30%, but complete recovery is still rare.