Abstract
The fine structure of crystalloid inclusions were found in the endothelial cells of capillary (strawberry) hemangiomas and cellular hemangiomas in 9 infants. The inclusions measured from 0.5-2.0 .mu.m in diameter and showed parallel lamellar bands with a regular periodicity of .apprx. 180-300 A. The presence of crystalloid inclusions and the absence of typical rod-shaped tubulated Weibel-Palade bodies suggest the immaturity and embryonic character of the endothelium present in the blood vessels of these kinds of hemangiomas.

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