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Cavernous hemangioma

Can be seen in skin and in internal organs like liver and pancreas.  In skin they manifest as elevated reddish blue  soft lesions.

Microscopy : large pools/spaces lined by single layer of endothelial cells and are  separated by fibrous stroma. “Cavern” means a large cave or hollow or cavity and hence the name “cavernous” for these lesions . These large spaces are filled with blood.