Ultrastructural study of hemangiomas in children.

: An electron microscopic study was carried out of different kinds of hemangiomas (capillary, cavernous and combined) in 18 children at the age of two months up to one year. Centers of differently expressed proliferation both of the endothelial cells and pericytes were found. The proliferation was most distinctly expressed in the capillary and cavernous hemangiomas. At the later stages, regressive and involutive changes, presented better in the capillary hemangiomas, were observed. The authors consider that hemangiomas, irrespective of their active cell growth, are tumours with a good prognosis.