No, AVM (Arteriovenous Malformation) is not a tumour. AVM is a congenital defect in the vascular system that is characterized by an abnormal connection between arteries and veins, bypassing the capillary system. This connection causes a direct flow of blood from the arteries to the veins, which results in an increased blood pressure and a high rate of blood flow in the affected area.
AVMs can affect any organ in the body, although they are most commonly found in the brain, lungs, liver, and spine. They can be either single or multiple, and can vary in size and severity. While AVMs can cause a variety of symptoms, such as headaches, seizures, and visual disturbances, they are not considered to be tumours.
Unlike tumours, which are abnormal growths of cells, AVMs are caused by the abnormal development of a vascular structure. This means that the affected area is not composed of abnormal cells, but rather an abnormally formed vascular structure. This is why AVMs are considered to be a congenital defect, rather than a tumour.
In some cases, AVMs can cause serious complications, such as stroke or hemorrhage, and can be treated with either surgery or a combination of embolization and radiotherapy. However, since they are not actually tumours, they cannot be treated with chemotherapy or radiation therapy.
In conclusion, AVM is not a tumour, but rather a congenital defect in the vascular system. It can cause serious complications, and must be treated with either surgery or embolization and radiotherapy.