LYMPH EXTJKAVASATE. 
343 
LYMPH EXTRAVASATE IN POSTERIOR LIMBS OF EQUID/E. 
Translated from an article by Prof. Hoffman in the Monatsheft fur Thierheil- 
kunde , by Richard Middleton, A.B., D.V.S. Stuttgart, Germany. 
Quite in the same manner as the traumatic .collection of 
blood originates, does the collection of serous fluid originate, 
which is at times seen upon one or other of the posterior limbs, 
more frequently in horses. Cases of such extravasate have 
been reported in cows and upon the ears of dogs. The swel¬ 
lings do not arise from the oozing of lymph through the 
lymph spaces in the fibrous tissue, or from the physiological 
foramina in the vessels themselves ; but from a rupture of the 
latter, a lymphorrhagia is established, and according to the 
laws of gravity the liquid collects at some inferior point. 
These tumors are not infrequently diagnosed as hsematomse, 
but when the surgeon opens them he is surprised to find not 
blood, but a transparent yellowish, or perhaps, reddish fluid. 
In human medicine, Gussenbauer, writing upon traumatic in¬ 
juries, rehearses cases of “ blood extravasate,” in which not 
blood but serum were found; the coagulum which should 
have been present, upon this hypothesis, was considered to 
have been absorbed, and that the hsemaglobin of the escaped 
corpuscles had imparted the red color which was occasionally 
seen. 
The first description of this species of swelling was written 
by the French surgeons, Velpeau and Moret-Lamottee. It 
was soon noticed that the tumors arose from, as a rule, one 
kind of injury ; to wit, a severe obliquely delivered blow on 
such regions of the anatomy in which fascia was present. In 
twelve cases recorded in man, seven were caused by a wheel 
passing over the spot; the remaining five were caused by 
blows tangentially received. 
Pathology : There must occur “ a gliding of the superficial 
portion of the region, upon the solider underlying parts,” 
through which the skin is not only torn from the subjacent 
muscles,but the still deeper tissues are compressed. 
Diagnosis : Directly after the infliction of such a wound 
as the above mentioned agents cause, there arises a swell- 
