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A case is described of mediastinal and hilar fibrosis in a woman aged 22 years. The fibrotic mass compressed the lobar arteries as well as the veins of various lobes of both lungs. These large vessels as well as numerous smaller arteries and veins were to a large extent obstructed by organized thrombi. It seems likely that 3 years after the beginning of symptoms the fibrosing process was still active. The case provides some support for an immunopathological aetiology of this condition.
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Sobrinho‐Simões et al. (1981) studied this question.
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