A disturbance occurring in a familial and a sporadic form. The familial form affects all races and is found more often in females. In Western countries insidious onset between 30 and 50 years of age, in Japan between 6 and 9 years of age. It is paucisymptomatic, with moderate exertional dyspnea and late symptoms of cor pulmonale. In the sporadic form sex distribution is equal.
- F. Harbitz:
Extensive calcification of the lungs as a distinct disease.
Archives of Internal Medicine, Chicago, 1918, 21: 139.
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