. The diseases of infancy and childhood : designed for the use of students and practitioners of medicine. tibia?, while the bones are still soft. CHONDRODYSTROPHIA FETALIS. {-So-called Fetal Rickets; Achondroplasia, Micromelia.) Definition.—This is a true dystrophia of cartilaginous growth in thelong bones, resulting in deformities which consist in a shortening of CHONDRODYSTROPHIA FETALIS 243 the extremities and certain changes in the bony structure of the of this rare condition have been reported in this country byJacobi, Smith, Herrman, and Townsend. Thomson, of Edinburgh,has des
. The diseases of infancy and childhood : designed for the use of students and practitioners of medicine. tibia?, while the bones are still soft. CHONDRODYSTROPHIA FETALIS. {-So-called Fetal Rickets; Achondroplasia, Micromelia.) Definition.—This is a true dystrophia of cartilaginous growth in thelong bones, resulting in deformities which consist in a shortening of CHONDRODYSTROPHIA FETALIS 243 the extremities and certain changes in the bony structure of the of this rare condition have been reported in this country byJacobi, Smith, Herrman, and Townsend. Thomson, of Edinburgh,has described the affection as of intra-uterine origin. AlthoughHorsley and Barlow classify these cases with sporadic cretinism, theyhave nothing in common either with cretinism or rachitis, aufl mustbe regarded as a distinct pathological entity. The jjatients are farfrom being idiotic or presenting any of the sjTnptoms of case published by Townsend was that of a stillborn and Jacobi have described infantile cases. Figs. 41 and 42.—Chondrodystrophia fetalis, or f \ k > 8 k 1 -^ * / 3 ^ Fig. 41.—Infant, aged nine months. Fig. 42.—Child, aged three years. Forms.—From a pathological stand-point there are three forms ofthis affection: The first is that in which there is a softening of theprimordial cartilage, or so-called chondromalacia fetalis; second, thatin which there is a cessation of growth of cartilage, so-called chondro-dystrophia hypoplastica; and lastly, the form in which there is anincreased but very irregular growth of the cartilaginous part of thelong bones, .so-called chondrodystrophia hyperplastica. In all of theseforms the resulting deformities are characteristic. They are as follows: (a) The skull has a peculiar form, the vertex is large. The rootof the nose in one set of cases is sunken; in another set the whole nose 244 DISEASES DUE TO DISTURBANCES OF NUTRITION is flattened. In both sets of cases a peculiar expres
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