[A useful addition to the cyto-diagnosis of hemorraegic pleural fluids: the histological examination of the clot (author's transl)].

As an addition to classical cytology, the authors propose this histological examination of the clot, which is frequently observed in pleural fluids. This clot is taken before any centrifugation which might alter the former cellular groups. This method has been undertaken on 98 cases out of 196. Only 61 clots were prepared according to the histological technique, out of which 24 were positive. The only criteria taken under consideration were the histioid, trabecular or glandular groups. This technique enables the authors to a precise diagnosis in about one third of the suspicious cases and, besides, to discover a few positive cases which had escaped the routine technique.