The authors report the demonstration of intrapulmonary and pleural lymphatics during lymphangiography. In a case of bilateral chylothorax the etiology was shown by reflux from the thoracic duct retrograde to visceral pleural lymphatics. Valvular insufficiency in the mediastinal and pulmonary lymphatics was present, a manifestation of a mild form of congenital pulmonary lymphangiectasis. A similar mechanism of reflux into parietal pleural lymphatics occurred in the second case, one of lymphosarcoma.
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Weidner et al. (1971) studied this question.