Like capillary hemangiomas, this type also varies greatly in size and can occur throughout the body. When they develop in the skin, cavernous hemangiomas are often referred to as "deep," and sometimes first appear as a bluish swelling underneath the skin. The blood vessels are not as closely packed as in a capillary hemangioma, and the spaces (or "caverns") between them are filled with blood.
Cavernous hemangioma. In contrast with a capillary hemangioma, a cavernous hemangioma is made up of larger blood vessels that are dilated (widened).Some appear as a spongy mass that covers an entire extremity (called "diffuse hemangioma" or "angiomatosis"). They can be small or large in size and may be flat to the skin, raised, or protrude out as a nodule. When it develops in the skin, a capillary hemangioma is often referred to as "superficial." Due to their close proximity to the surface of the skin, capillary hemangiomas are typically bright red in color. These capillaries form a tightly packed group held together by thin, connective tissue. It is made up of small capillaries that are normal in size and diameter, but high in number. Capillary hemangioma. This is the most common type of hemangioma.
Some of the more common types are described below: It is possible to have more than one hemangioma. A hemangioma occurs when small blood vessels begin to multiply at an abnormal rate and form a mass or lump.