The swollen legs of a patient with congenital lymphoedema.
Lymphoedema is a condition in which lymph (a colourless tissue fluid) collects in excess quantities due to a defect in the lymphatic system (a system of vessels that allow lymph to circulate around the body).
There are two main types of lymphoedema - primary and secondary. Primary lymphoedema can be divided into three types: congenital (present at birth); lymphoedema praecox; and lymphoedema tarda (late-onset). Secondary lymphoedema can