Cavernous sinus thrombosis is a rare but serious condition where a blood clot forms in the cavernous sinus, a large vein located at the base of the skull. This can disrupt normal blood flow and lead to increased pressure in the brain. It often results from infections, such as those in the face or sinuses, that spread to the veins. Symptoms may include severe headache, vision problems, and swelling around the eyes. Prompt diagnosis and treatment are crucial, as complications can be life-threatening. Treatment typically involves antibiotics and may require anticoagulant medications to dissolve the clot.