. Roentgen interpretation; a manual for students and practitioners . very slow development, by the fact that theirstructure is that of normal bone and that they blend into the boneat their site of origin. They are most commonly found near the endsof the long bones in adults. They may consist of hook-shaped pro-cesses called exostoses or broad, romided masses—true osteomata. Enchondromata.—Enchondromata cause irregular eccentric enlarge-ments of the bones. They are usually multiple and are most commonin the hands, feet and long bones. There is considerable distortionin the outline as a result o
. Roentgen interpretation; a manual for students and practitioners . very slow development, by the fact that theirstructure is that of normal bone and that they blend into the boneat their site of origin. They are most commonly found near the endsof the long bones in adults. They may consist of hook-shaped pro-cesses called exostoses or broad, romided masses—true osteomata. Enchondromata.—Enchondromata cause irregular eccentric enlarge-ments of the bones. They are usually multiple and are most commonin the hands, feet and long bones. There is considerable distortionin the outline as a result of tumor growth with or without thinningof the cortex, and the trabeculse of the medulla may be replaced by BONE TUMORS 63 a homogeneous, putty-like shadow or by multiple small roundedareas of rarefaction. In extensive tumors the thinning of the cortexmay be so extreme that it is reduced to small, thin flakes of bone onthe periphery of the growth, which in the flat plate are projectedupon the tumor and must be differentiated from calcification withinthe Fig. 39.—Osteomata of the femur. Multiple Cartilaginous Exostoses.—Multiple cartilaginous exostosesare an hereditary anomaly of development, in which large cartilagi-nous outgrowths of diminished density and irregular outline appearin the region of the epiphyseal lines. These growths are multiple,usually involving most of the epiphysis, and cause considerabledeformity and interference with the normal development of the boneinvolvement. 64 BONE PATHOLOGY Bone Cysts.—Bone cysts occur in the long bones and in the are characterized by sharply defined, rounded or oval areasof rarefaction containing few or no trabeculse. The process isentirely within the shaft, and spreads longitudinally in the medullawithout involving the cortex which, however, may be considerablythinned from pressure. There is no deformity in outline unless a
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