Elastofibroma of the greater omentum.

A rare case of elastofibroma developing in the greater omentum of a 76 years old woman was reported. The greater omentum was thickened in a plate-like shape to a size of 24 X 15 X 2 cm, and a firm mass as large as 5 X 4 X 3 cm was formed in a portion of the omentum. Granulomatous inflammation associated with the calcification was present in the center region of the mass. Collagen fibers and elastofibroma fibers were markedly proliferated around the granuloma. Fibrosis accompanied with the formation of elastofibroma fibers was observed not only around the granulomatous inflammatory focus but also throughout the thickened omentum. The elastofibroma fiber in this case lost its stainability to resorcin-fuchsin and orcein after 4 hours treatment with elastase. It may be inferred that not only mechanical stresses but also inflammatory stimuli contribute to the development of elastofibroma.