Hemangioma
| Definition: |
An extremely common benign tumor, occurring most commonly in infancy and childhood, made up of newly formed blood vessels, and resulting from malformation of angioblastic tissue of fetal life. It can occur anywhere in the body but is most frequently noticed in the skin and subcutaneous tissues. About 75% are present at birth, and about 60% occur in the head and neck area. The majority in infancy will regress spontaneously. Some hemangiomas grow rapidly during the early months of life and may be a source of some concern, although virtually all disappear by about 5 years of age. They do not metastasize and simple excision will often be curative. (Dorland, 27th ed; from Stedman, 25th ed; DeVita Jr et al., Cancer: Principles & Practice of Oncology, 3d ed, p1355) |
| Notes: |
coord IM with precoord organ/neopl term (IM); CENTRAL NERVOUS SYSTEM VENOUS ANGIOMA is also available |
| Also Called: |
Hemangioma, Histiocytoid,Hemangioma, Intramuscular |
Hemangioma Categories.
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Central Nervous System Venous Angioma - A congenital anomaly characterized by clusters of dilated hypertrophic veins surrounded by normal nervous system tissue. The blood vessels have thin walls composed of a single layer of fibromuscular tissue lined by epithelium. These lesions may occur in the brain, but are more frequent in the spinal cord and spinal meninges. The incidence of hemorrhage is relatively low, but when it occurs it may be associated with venous infarctions of the nervous system. (From Davis et al., Textbook of Neuropathology, 2nd ed, pp628-9) |
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Hemangioendothelioma - A neoplasm derived from blood vessels, characterized by numerous prominent endothelial cells that occur singly, in aggregates, and as the lining of congeries of vascular tubes or channels. Hemangioendotheliomas are relatively rare and are of intermediate malignancy (between benign hemangiomas and conventional angiosarcomas). They affect men and women about equally and rarely develop in childhood. (From Stedman, 25th ed; Holland et al., Cancer Medicine, 3d ed, p1866) |
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Hemangioma, Capillary - A dull red, firm, dome-shaped hemangioma, sharply demarcated from surrounding skin, usually located on the head and neck, which grows rapidly and generally undergoes regression and involution without scarring. It is caused by proliferation of immature capillary vessels in active stroma, and is usually present at birth or occurs within the first two or three months of life. (Dorland, 27th ed) |
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Hemangioma, Cavernous - A vascular tumor preponderantly composed of large dilated blood vessels, often containing large amounts of blood, occurring in the skin, subcutaneously, or both, and also in many viscera, particularly the liver, spleen, pancreas, and sometimes the brain. The typical superficial lesions are bright to dark red in color; deep lesions have a blue color. A cavernous hemangioma in the skin extends more deeply than a capillary hemangioma and is less likely to regress spontaneously. (Dorland, 27th ed; from Stedman, 25th ed) |
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Sturge-Weber Syndrome - A congenital syndrome characterized by a port-wine nevus covering portions of the face and cranium (in the distribution of the ophthalmic division of the TRIGEMINAL NERVE) and angiomas of the meninges and choroid. Clinical manifestations include the onset of focal SEIZURES, progressive hemiparesis, GLAUCOMA, hemianopsia, and cognitive deficits in the first decade of life. By age two years, skull radiographs reveal "tramline calcifications" of the margins of the occipital and parietal lobes. Pathologically cortical neurons are replaced by glial tissue that undergoes calcification. (From Adams et al., Principles of Neurology, 6th ed, pp1018-9) |
Hemangioma Definitions and Terms
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