. American quarterly of roentgenology . fully ossified ends in adultsare relatively far better developed than the diaphyses orshafts. This is one of the most characteristic radiographicfeatures of achondroplasia. In the cretin the appearance is practically the reverse, theepiphyses appearing relatively less well developed if any-thing than the shafts. This is one of the most important pointsof distinction between the twTo diseases radiographically. In rickets the epiphyseal ends may appear relatively moredeveloped than the shafts clinically, but their actual develop-ment as indicated radiograp
. American quarterly of roentgenology . fully ossified ends in adultsare relatively far better developed than the diaphyses orshafts. This is one of the most characteristic radiographicfeatures of achondroplasia. In the cretin the appearance is practically the reverse, theepiphyses appearing relatively less well developed if any-thing than the shafts. This is one of the most important pointsof distinction between the twTo diseases radiographically. In rickets the epiphyseal ends may appear relatively moredeveloped than the shafts clinically, but their actual develop-ment as indicated radiographically by the extent of ossificationis not materially greater, and certainly never to the extentwhich is characteristic of achondroplasia. 5. In all of the long and the short long bones of the extremi-ties a relatively greater degree of development of thediaphyses seems apparent in the immediate neighborhood ofthe epiphyseal lines, and this is manifest in all of them to agreater or less extent in an abrupt expansion at the epiphyseal. Fig. 2—Lower extremities of a case of Cretinism. Female, aged ten years. Pancoast: X-ray Diagnosis 91 ends of the diaphyses, and to a width corresponding to that ofthe ossified epiphyses. In cretinism, although the ends of the diaphyses are verymuch wider than at the middle, there is not the abrupt expan-sion so characteristic of achondroplasia, but it is gradual as inthe normal individual. The same may be said of rickets. 6. In the case of the metacarpals and metatarsals thispeculiar feature gives rise to a very characteristic radiographicappearance in the hands and feet, and one which is not seenin either cretinism or rickets. 7. The same tendency is manifest in the immediate neigh*borhood of ossification centers of which the growth in generalof the shaft is entirely independent, and entirely or nearly solocally, as at the olecranon and lesser trochanter. In the lat-ter instance it is manifest even before epiphyseal ossificationbegins, and th
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