It is the most common tumor of the placenta.<unk> s over the size of 5 cm in diameter are rare, and occur at a rate of 1:3500 to 1:16,000 births. Smaller<unk> s are more frequent, with an incidence of 14‑139:10,000 births. However, many small<unk> s may not be sonologically visible and hence go unreported. In a clinical study, more than half of all tumors were discovered only by histological techniques.
Chorioangioma
Chorangioma
Spider angioma
Lymphohemangioma
Lymphangioma
Tufted angioma
Hemangioma
Cavernous hemangioma