. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PRODUCTS, ADVENTITIOUS. 133 many surgical writers confounded, under the erroneous name of " cartilaginous exostosis " (erroneous, if for no other reason, because the formation in question may spring from other tissues than bone), with products of essentially different character, and by some other authors described as colloid cancer. When uncut, enchondroma exhibits itself as a tumour of moderate size and spheroidal non-lobulated shape, encased in cellular mem- brane, or (if it spring from bone) in perios- teum,
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PRODUCTS, ADVENTITIOUS. 133 many surgical writers confounded, under the erroneous name of " cartilaginous exostosis " (erroneous, if for no other reason, because the formation in question may spring from other tissues than bone), with products of essentially different character, and by some other authors described as colloid cancer. When uncut, enchondroma exhibits itself as a tumour of moderate size and spheroidal non-lobulated shape, encased in cellular mem- brane, or (if it spring from bone) in perios- teum, ossified or not. The section discovers a firmly gelatinous substance, rather pellucid, of very pale greyish or greenish yellow tint, set (without firm adhesion) in loculi inclined to spheroidal outline, varying in size, and having their walls formed of a dense dull white tissue (fg. 95). One of the rough marks Fig. Section of Enehondroma. (After Muller.) of distinction between this growth and colloid cancer consists in the mode of arrangement of the walls of the loculi : in the latter, when fully grown, the walls seem cut across sharply at right angles with their course ; in the for- mer it is extremely common to find the walls exhibiting flat ami extensive surfaces to the eye, as though the loculi had been opened to a very small extent only. The general mass is firm ; when the invest- ment is periosteal or bony, proportionably increased. The intra-locular matter is in it- self soft, yet has a sharp fracture. Bony matter in its interior of course increases its consistence, and may be formed of: 1, the walls of the loculi converted into thin osseous plates, which give a crackling crispness to the mass; 2, particles of the spongy tissue of the original bone in which it has grown ; 3, sta- lactitbrm osteoph}tes springing into its sub- stance. No appearance of vessels strikes the un- assisted eye in these masses ; but von- \Val- ther and Weber (Gra'fe and Walther's Journ., b
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