Thrombosis (from Ancient Greek θρόμβωσις thrómbōsis "clotting") is the formation of a blood clot inside a blood vessel, obstructing the flow of blood through the circulatory system. When a blood vessel (a vein or an artery) is injured, the body uses platelets (thrombocytes) and fibrin to form a blood clot to prevent blood loss. Even when a blood vessel is not injured, blood clots may form in the body under certain conditions. A clot, or a piece of the clot, that breaks free and begins to travel around the body is known as an embolus.Thrombosis may occur in veins (venous thrombosis) or in arteries (arterial thrombosis). Venous thrombosis (sometimes called DVT, deep vein thrombosis) leads to a blood clot in the affected part of the body, while arterial thrombosis (and, rarely, severe venous thrombosis) affects the blood supply and leads to damage of the tissue supplied by that artery (ischemia and necrosis). A piece of either an arterial or a venous thrombus can break off as an embolus, which could then travel through the circulation and lodge somewhere else as an embolism. This type of embolism is known as a thromboembolism. Complications can arise when a venous thromboembolism (commonly called a VTE) lodges in the lung as a pulmonary embolism. An arterial embolus may travel further down the affected blood vessel, where it can lodge as an embolism.
Aase syndrome or Aase–Smith syndrome is a rare inherited disorder characterized by anemia with some joint and skeletal deformities. Aase syndrome is thought to be an autosomal dominant inherited disorder. The genetic basis of the disease is not known. The anemia is caused by underdevelopment of the bone marrow, which is where blood cells are formed. It is named after the American paediatricians Jon Morton Aase and David Weyhe Smith, who characterized it in 1968. Signs and symptoms
Among the presentation are:
Mildly slowed growth
Pale skin
Delayed closure of fontanelles (soft spots)
Narrow shoulders
Triple jointed thumbs, absent or small knuckles, decreased skin creases at finger joints
Inability to fully extend the joints from birth (congenital contractures)
Cleft palate
Deformed ears
Droopy eyelids

Complications
Complications related to anemia include weakness, fatigue, and decreased oxygenation of the blood. Decreased white blood cells alter the bodys ability to fight infection. If a heart defect exists, it may cause multiple complications (depending on the specific defect). Severe cases have been associated with still birth or early death. Cause
Some cases of Aase syndrome (45%) have been shown to be inherited, and are due to a change in one gene which makes ribosomal proteins. However, many cases are not inherited and occur without a known cause. Diagnosis
A CBC (complete blood count) will show anemia and a decrease in the white blood cell count. An echocardiogram may reveal heart defects (ventricular septal defect is most common). X-rays will show skeletal abnormalities as described above. A bone marrow biopsy may be performed.