The vascular sinus, or venous sinus, refers to the inflated portion of a localized vein and is due to the tissue structure of the venous valves present within the vein.
1. Venous valves refer to the semilunar sac-like membrane formed by the wall lining of a vein protruding into the lumen, which serves to stop the backflow of blood and to ensure unidirectional flow of blood. They are usually found in areas of high venous pressure, such as the lower extremity valves, to ensure the return of blood from the lower extremities to the heart.
2. Localized dilatation of the venous vessels in which the valves are located is normal and physiological. However, if the venous sinus is significantly dilated and accompanied by severe dilatation and tortuosity of the blood vessels, it is necessary to pay attention to whether there is damage to the venous valves or varicose veins caused by lesions, and then it is necessary to go to the hospital in time and follow the doctor’s instructions for treatment.