Pre-elastofibroma and elastofibroma (the continuum of elastic-producing fibrous tumors). A light and ultrastructural study.

A fibroproliferative lesion arising anterior to the lower end of the scapula and containing polymorphic often fiberlike deposits of weakly elastinophilic fibrillary material is described. It is compared on the light and ultrastructural level to a typical elastofibroma. The fibrillary material seen in this tumor strongly resembles that which surrounds the strongly elastinophilic deposits in the typical elastofibroma and from which the elastin is thought to be derived. It is concluded that elastin-producing tumors form a continuum; at one end of which lies the tumor we have designated pre-elastofibroma and at the other, the typical elastofibroma.