382 Pseudo-Leukemia. 



its nature with leukemia and depends on a general affection 

 of the IjTnphatic hematopoetic tissue (Rouvier, Jaccoud, Colm- 

 heim, Nocard, Hirschfeld & Jacoby). According to this view 

 pseudo-leukemia would therefore represent only a form of 

 leukemia, in which however the flooding of the circulating blood 

 with white blood corpuscles is absent, as agglutinines are possi- 

 bly present in the parts producing white blood corpuscles 

 (Ellermann & Bang), or there occurs no irruption of the 

 proliferating IjTnphoid or myeloid tissue into the blood stream 

 (Marchand, Neumann). In addition to this exceptional transi- 

 tory stages of i^seudo-leukemia were observed in leukemia of 

 man, whereas in chicken leukemia, as already mentioned, about 

 half of the birds manifest simple pseudo-leukemic changes in 

 the presence of the same anatomical lesions in the blood-forming 

 organs and in the liver. As a matter of fact Pinkus accepts 

 pseudo-leukemia as identical with lymphatic leukemia, or at least 



— C 



a 



Fig. 156. Pseudo-JculvemUt : a enlar<;ed vetropliai yiijieal gland: h enlarged prescap- 

 ular lymph p^land ; c enlarged preerural lymph gland. 



as a very closely related alfection. However recently pseudo- 

 leukemias of myeloid types were also noted in man, and the 

 pseudo-leukemic form of chicken leukemia very likely also be- 

 longs to this group. 



In opposition to this, other authors, even at the present 

 time, are supporting the view of the first recorder of pseudo- 

 leukemia (Hodgkin), according to which both diseases would 

 not be etiologically identical. In this they seek support in the 

 fact that pseudo-leukemia hardly ever passes into leucocytemia. 



At tlie present time various diseases are comprised under the 

 name of pseudo-lenkemia. Excluding the pseudo-leukemia i^roper which 



