Kasuistischer Beitrag zur pathologischen Anatomie der

7567 Springer International Publishing AG. Part of Springer Nature. We wish to express our thanks to Dr. Louis Casamajor and Dr. Frank Pike of the College of Physicians and Surgeons, for the use of laboratory facilities in the experimental work and to Miss Schreiber and Miss Mara of our laboratory for their valuable help in the technical work. The right auricle is the primary site of leukotic changes in the bovine heart.

This and other regions of the heart from 669 cattle with manifest leukosis, 99 cattle with suspected latent leukosis, 78 normal cattle, and 59 foetuses have been examined histologically. The propensity of bovine leukosis to involve the right auricle is obviously associated with the loose subepicardial connective tissue and its property of embryonal haematopoiesis. Since other mesenchymal tumours and metaplasia also involve the right auricle more often than the left, it is conceivable that the subepicardial tissue on the right side remains functionally as well as morphologically undifferentiated, and more readily responds to proliferative stimuli than does the subepicardial tissue of the left atrium, which early differentiates into fat tissue. Among the group of animals suspected of latent leukosis there were many with definite signs of leukosis in the subepicardial tissue of the right auricle. The early signs of leukosis were accumulation of lymphoid or blast-like cells, or both together, neural lymphoid infiltration, and stuffing of blood vessels with lymphocytes. The question whether the leukosis cells are formed in situ in the heart or represent metastasis from another site remains unsettled. The demonstration of a particular tissue type at the primary site of cardiac leukosis implies that further study might resolve this point and elucidate the early changes of leukosis. Leukoseveränderungen im Herzen des Rindes werden hauptsächlich in der Auricula cordis dextra (rechtes Herzohr) beobachtet. Diese sowie andere Gegenden des Herzens von 669 Rindern mit manifester Leukose, 99 Rindern mit Verdacht auf latente Leukose, 78 normalen Rindern und 59 Feten wurden histologisch untersucht. Die Neigung der Rinderleukose, das rechte Herzohr anzugreifen, hängt offensichtlich mit dem lockeren, subepikardialen Bindegewebe und seiner Eigenschaft der embryonalen Hämatopoese zusammen. Da auch andere Mesenchymtumore sowie Metaplasie das rechte Herzohr häufiger angreifen als das linke, ist es denkbar, dass das subepikardiale Gewebe der rechten Seite funktionell als auch morphologisch un-differenziert bleibt und schneller auf proliferative Reize reagiert als das subepikardiale Gewebe des linken Herzvorhofes, welches sich früh-zeitig zu Fettgewebe differenziert. Viele der Tiere mit Verdacht auf latente Leukose wiesen deutliche Zeichen einer Leukose im subepikardialen Gewebe des rechten Vorhofes auf. Die frühen Anzeichen bestanden aus einer Ansammlung von lymph- bzw. Blastemartigen Zellen oder beiden, aus Lymphinfiltrationen der Nerven und aus einer Stauung der Lymphozyten in den Blutgefässen.

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Prof. Dr. D. Böhme, Department of Pathology, State University of New York at Buffalo, Buffalo 69769, N.