The origin of<unk>  is from primitive chorionic mesenchyme. It develops when the blood vessels and stroma undergo rapid proliferation independent of the surrounding tissue. Based on histological features,<unk>  is classified by Marchetti into three types: *Cellular type : This type is immature and contains mostly cellular elements packed compactly. * Angiomatous (vascular) type : This is the most common type of choriocarcinoma. It is distinguished by the presence of numerous small blood vessels. * Degenerative type : This is the mature type with degenerative changes. Each type is believed to represent a phase of tumor development.<unk>  has no malignant potential.
Chorioangioma
Chorangioma
Spider angioma
Lymphohemangioma
Lymphangioma
Tufted angioma
Hemangioma
Cavernous hemangioma