The main clinical manifestations of antiphospholipid antibody syndrome are thrombosis, habitual abortion, and thrombocytopenia, which can occur in the same patient with only one of these manifestations or with multiple manifestations at the same time. The clinical manifestations depend on the type, location and size of the involved vessels, and can manifest as single or multiple vessel accumulations. Venous thrombosis is more common than arterial thrombosis in antiphospholipid antibody syndrome. Venous thrombosis is most common in the deep veins of the lower extremities, but can also be seen in the kidneys, liver, and retina, while arterial thrombosis is more common in the brain and upper extremities. Reticular cyanosis is also the most common manifestation of antiphospholipid antibody syndrome, manifested by reticular cyanosis on the arms and legs, which can be seen in about 80% of patients.