[1] Examples of vascular tumors include hemangiomas, hemangioendotheliomas, Kaposi's sarcomas, angiosarcomas, and hemangioblastomas.

[5] They are characterised by the abnormal proliferation of endothelial cells and of deviant blood vessel formation or architecture.

[6] There are two main variants of congenital hemangioma: non-involuting, and rapidly involuting (beginning in the first year of life).

A range of benign vascular tumors are described as reactive proliferative lesions that grow in response to a stimulus, such as trauma, or a local thrombosis.

[10] The most common type of reactive proliferative tumors are pyogenic granulomas also known as lobular capillary hemangiomas, that are more often found in children and young adults.

[4] Tufted angiomas are hereditary hemangiomas found in infants from birth to five years of age, however they may occur in adults.

[12] They typically have a deep nodular component sometimes extending into the subcutaneous tissue, fascia, and muscle, and can sometimes be painful.

[11] They are also associated with the local secretion of growth factors that affect angiogenesis and promote the development of vascular lobules.

[14] KHEs show as a red or purple expanding mass of soft tissue,[14] found mostly in infants.

Under the microscope KHE is characterised by nodules of tumor-like spindled endothelial cells.