Soft tissue tumors on the hand are frequent and usually benign. The hand is a fine clockwork with many structures in a very small space: muscles, tendons, tendon sheaths, ligaments, skin, blood vessels and nerves. In all these tissues cells can multiply unchecked. Both hands correspond to two percent of the total body surface. The hands make up only 1.2 percent of the total body weight. However, fifteen percent of all soft tissue tumors of the body are found on the hand.
Vascular malformations are malformations of the vessels that can occur throughout the entire body. The vascular malformations are subdivided according to the flow velocity of the blood flow. Vascular malformations with a high flow velocity transport oxygen-rich arterial blood from the heart. Malformations with a low flow velocity transport oxygen-poor venous blood to the heart. Most vascular malformations are partly arterial and partly venous. At the body surface, malformations are noticeable by a bluish discoloration of the skin. Arterial vascular malformations are characterized by a palpable pulsation and possibly a flow noise. Vascular malformations mainly affect children and adolescents.