Morphogenesis and Histomechanics of the Benign Connective Tissue New-Growths of the Skin*

Among the benign connective tissue neoplasms of the skin various forms have been grouped together. This is undoubtedly the result of different criteria for their differentiation by clinicians and pathologists, and to the various morphological aspects presented by these new-growths. Thus, along with vascular and muscular neoplasms histiocytomata (Woringer (1), Diss (2)), recurring dermatofibromata (Darier-Ferrand (3), Hoffmann (4)), fibromata (Unna (5), Civatte (6)), xantho-mata and also, both because of their morphology and because of particular views on their histogenesis, neurofibromata, neurinomata (Mosto (7), Stewart-Copeland (8)) and sclerosing an-giomata (Penner (9), Evans (10)) have been described and classified as self contained units. Other authors like Stout (11) have applied to a great part of these neoplasms the more generic term of mesenchymomata. These different classifications have also been due, to a large extent, to the various theories about the morphology and the embryology and histogenesis of connective tissue.