SS2 



Pseudo-Leukemia. 



its nature with leukemia and depends on a general affection 

 of the lymphatic hematopoetic tissue (Rouvier, Jaccoud, Cohn- 

 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 lymphoid or myeloid tissue into the blood stream 

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

 tory stages of pseudo-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 



Fig. 156. Pxeiido-Ieuli-Piiiin : n eiilaiKed retropliaryuKfal gland; /; oiilarged jirescap- 

 ular h'm|jli gland ; c enlarged jn-eeiuial ]ym])h gland'. 



as a very closely related affection. 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 botli diseases would 

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

 fact tliat pseudo-leukemia hardly ever passes into leucocytemia. 



At the present time various disea.ses are compri.sed under the 

 name of psemlo-lenkemia. Excluding the psendo-leukeiiiia proper which 



