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A hemangioma or haemangioma is a usually benign vascular tumor derived from blood vessel cell types. The most common form, seen in infants, is an infantile hemangioma , known colloquially as a "strawberry mark", most commonly presenting on the skin at birth or in the first weeks of life.
Hemangioma tumors are a result of rapid proliferation of endothelial cells and pericytic hyperplasia, or the enlargement of tissue as a result of abnormal cell division pericytes. The pathogenesis of hemangioma is still not understood. It has been suggested that growth factors and hormonal influences contribute to the abnormal cell proliferation.
Cherry angioma, also called cherry hemangioma [1] or Campbell de Morgan Spot, [2] is a small bright red dome-shaped bump on the skin. [3] It ranges between 0.5 – 6 mm in diameter and usually several are present, typically on the chest and arms, and increasing in number with age. [3] [4] If scratched, they may bleed. [5]
A cavernous liver hemangioma or hepatic hemangioma is a benign tumor of the liver composed of large vascular spaces lined by monolayer hepatic endothelial cells. It is the most common benign liver tumour, and is usually asymptomatic and diagnosed incidentally on radiological imaging or during laparotomy for other intra-abdominal issues.
Composite hemangioendothelioma is a low-grade angiosarcoma typically occurring in adults, although it has been described in infancy. [ 2 ] : 601 Spindle-cell hemangioendothelioma [ 3 ] ) is a vascular tumor that was first described in 1986 by Sharon Weiss, M.D. , [ 4 ] and commonly presents in a child or young adult who develops blue nodules of ...
Infantile hemangiomas are the most common type of vascular tumor to affect babies, [4] accounting for 90% of hemangiomas. [5] They are characterised by the abnormal proliferation of endothelial cells and of deviant blood vessel formation or architecture. [6] Hypoxic stress seems to be a major trigger for this. [7]
Microvenular hemangioma is an acquired benign vascular tumor that presents as an asymptomatic, slowly growing, 0.5- to 2.0 cm reddish lesion on the forearms or other sites of young to middle-aged adults. [2] The cause of microvenular hemangioma is unknown, however it has been associated with immunosuppression.
Hemangioblastomas usually occur in adults, yet tumors may appear in VHL syndrome at much younger ages. Men and women are approximately at the same risk. Although they can occur in any section of the central nervous system , they usually occur in either side of the cerebellum , the brain stem or the spinal cord .