抄録
Radiological investigations were conducted on the relation between primary lesions and secondary, lesions, the period from onset of infection to metathesis stage, and on the prognosis of the metathesis, in 49 tuberculoss cases in Myojo National Sanatorium, during the period from April 1949 to March 1953. The results were as follows:
1) The primary lesions of secondary pulmonary tuberculosis were located generally in the upper fields of the lungs, As for the original lesions accompanied by cavities, such cavities were found almost always in the dorsal part of the apex of upper lobe, and there were few cases of which cavities were found in the upper part of lower lobe.
2) In case of the metathesis of cavity, new cavity was found to be located lower than the location of tide original cavity and the new cavity was frequently found in thee opposite side to the original cavity. If the cavity was in apex area, so-called ‘apicocaudally’ metathesis was frequently observed.
3) Secondary lesions were frequently located in the upper fields of lungs, and few in the apex fields. When they were in the upper or lower fields, they were situated mm re or less centrifugally and those in the middle fields region were frequently centripetal locations. Metathesis lesions in the upper fields inclined to develop into cavities.
4) The secondary lesions of cases who had haemoptysis in their anamnesis appeared lower than the primary lesions disseminatedly.
5) Since acinous lesions, tuberculoma and productive lesions without, cavities had also the possibility of developing metathesis, considerations should be paid against fresh cases.
6) The periods from the onset to the metathesis were between 3 months and 4 2 years. In most cases, they were within one year to three yeas. Lesions accompanied by cavities caused metathesis more quickly than those without cavity.
7) Prognosis of the metathesis had more close relation with the nature of the respective lesions than the dimensions of the lesions. Lesions having cheesy degenerations with thick x-ray shadows in their center inclined to develop into cavities Temporary infiltration inclined to be entirely absorbed. If lesions were of the same nature, the bigger ones were worse in their prognosis. Lesions, which had evenly thick x-ray shadows and which were larger than the dimensions of a lobules, frequently inclined to become cavities. Disseminated lesions had far better prognosis than the infiltrated lesions.
