Hemangioma is a tumor made up of blood-vessels separated by a small amount of connective tissue.

Angioma Simplex

Angioma Simplex or nevus when the vessels are small and 10 very much interwoven. To this class belong the reddish dis-colorations known as birth-marks.

Cavernous Angioma

Cavernous Angioma when the blood-spaces are large and separated by distinct fibrous bands. Resembles the structure of the corpus cavernosum of the penis.

Plexiform Angioma

Plexiform Angioma when a group of more or less parallel blood-vessels become tortuous and widely dilated.

Fig. 53. - Cavernous Angioma (Warren).

Lymphangioma

Lymphangioma is a tumor caused by a dilatation of lymphatic vessels with an arrangement quite similar to that of the hemangioma.