. Roentgen diagnosis of diseases of the head . , furthermore, very gradual transitions betweenthe typical basilar invagination and the elevation of the skullbase to be observed in the various skeletal diseases, as puer-peral and senile osteomalacia, osteitis deformans (Paget), anddysostosis cleidocranialis which bring about a kind of basilarinvagination along Avith theii- other changes in siiape andstructure. Some cases in the liteiature considered as tuber-culous caries, or described under other mimes, are probablyto l)e classed here also (Homen). The examination of the skull base with the x-
. Roentgen diagnosis of diseases of the head . , furthermore, very gradual transitions betweenthe typical basilar invagination and the elevation of the skullbase to be observed in the various skeletal diseases, as puer-peral and senile osteomalacia, osteitis deformans (Paget), anddysostosis cleidocranialis which bring about a kind of basilarinvagination along Avith theii- other changes in siiape andstructure. Some cases in the liteiature considered as tuber-culous caries, or described under other mimes, are probablyto l)e classed here also (Homen). The examination of the skull base with the x-i-ay is in(lis])en-sable for the diagnosis of basilar invagination. The roentgen-ogram permits the determination of the clianuc in t he curxat urcof the posterior cranial fossa, as well as the rudimentai-y 122 ROENTGEN DIAGNOSIS OF DISEASES OP THE HEAD formation of tlio atlas and e]iislr()pheiis. The roentgenogramAvil] also permit tlie discovery of erosions of the inner surfaceof tlie sknll, llu oiigin of A\hich is to he atti-ihnted to an in-. Fig. 21.—A print from an x-ray plate of Case 1, a woman, forty-one years old,with basilar invagination. The pictuie brings out quite clearly the almost pathog-nomonic iiosition of the head. One gets also a very clear picture of the nearly flatskull base due to a shoving up of the posterior cranial fossa by the cervical vertebr:c. 3^LLA
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