. Roentgen interpretation; a manual for students and practitioners . 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 ch
. Roentgen interpretation; a manual for students and practitioners . 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. Fig. 40.—Multiple cartilaginous exostosis. fracture has occurred. Spontaneous fractures are often the firstindication of the presence of a lesion and they are usually followedby extensive callous formation. Osteitis Fibrosa.—Allied to cystic disease is a rare condition whichmay involve one or all of the bones. It consists in the replacementof the normal structure by irregular strands of trabeculse enclosing BONE TUMORS 65 multiple cysts which vary in size and shape. There is considerableexpansion in the bone, and spontaneous fractures are common asa result of the thinning of the cortex. There is no periosteal pro-liferation. When cysts occur in the neighborhood of epiphyseallines there may be interference with growth.
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