_Causes._ This disease appears to be rather frequent in pigs, in
connection with high feeding, and more particularly with leucocythæmia
and lymphadenoma. It is further a complication of tuberculosis and of
neoplasms located in the spleen, and of hepatic, cardiac and pulmonary
disorder.
_Lesions._ In leucocythæmia there is general enlargement of the spleen,
and especially of the Paccinian bodies which may attain the size of a
pea (Leisering, Fürstenberg, Bollinger, Siedamgrotzky, Röll, Ellinger).
The total weight of the organ may attain to 5 lbs. (Mathieu), or 13 lbs.
(Goubaux). In a remarkable case recorded by Zell, the organ measured 30
inches in its longest circumference and 20 inches in its shortest. It
had an enormous thickening of the capsule and trabeculæ which enclosed
softened contents in a state of fatty degeneration.
_Symptoms_ are wanting, as most of the observed cases were only
discovered after the animal had been killed for pork.