Klippel-Trenaunay Syndrome (KTS) is one of the rare congenital hyperplasia syndromes generally involving a single extremity characterized by port-wine-stain-type cutaneous vascular malformations, bone and soft tissue hypertrophy, and varicose veins. It was described by the French doctors Maurice Klippel and Paul Trenaunay for the first time in 1900s. Later, the investigators Parkes and Weber described the accompanying arterial abnormalities, arteriovenous fistula, and arterial aneurysms. The disease affects men and women at an equal rate and is not limited to any racial groups. The purpose of this article is to introduce an extremely rare case of KTS with three hypertrophic extremities, presenting with the findings of spinal nerve root compression due to arteriovenous malformation located in the lumbar spinal canal with a literature review.