CHRONIC SYNOVITIS—DROPSIES. 341 
‘This thoroughpin is without gravity,  Blisterings being unsuccessful, 
‘deep cauterization must be resorted to. One may also, without fear of 
complication, open the sheaths with the bistouri, making an incision 
parallel to the cunean tendon. 
The calcanean thoroughpin, due to the dilatation of the synovial cap- 
sula which assists the sliding of the tendon of the perforatus over that of 
‘the gastrocnemius and the apex of the os calcis, is characterized by an 
elongated, cylindroid tumor, extending from the summit of the hock 
upwards more or less along the tendon. Sometimes there are two 
parallel dilatations. If interference is necessary, deep cauterization and 
irritating injections are indicated. Incision is dangerous; if suppuration 
occurs, a diffused inflammation takes place and.serious complications are 
to be feared. 
As they pass on the anterior face of the hock and of the superior 
metatarsal region, the tendons of the extensors of the phalanges are lined 
with synovials, which are often the seat of dropsical conditions. According 
to one or both of the sacs being affected, there exists, on the antero- 
external face of the hock and of the superior portion of the metatarsal, 
one or two cylindrical dilatations, more or less soft, located alongside the 
tendons. These are often communicating together, and in this case the 
tumor is diffuse and more or less prominent. Sometimes both hocks dre 
affected. 
These thoroughpins seldom give rise to lameness ; it is better to leave 
them alone. Irritating injections and needle cauterization are the best 
means to treat them. Rebel cases are treated with puncture on their 
lower part, drainage and antisepetic injections of the sac. 
VI—Sesamoid Sheaths. 
Tendinous windealls are formed by the distension of the great sesamoid 
sheath. They constitute above the sesamoids, along the tendons of the 
flexors, rounded or ovoid swelling, varying in size and consistency, rarely 
extending beyond the button of the small cannon bones. Situated more 
posteriorly than articular windgalls, they extend as high along the tendons. 
At times the dropsy is well marked only on one side——the windgall is 
simple ; most generally, the external and internal dilatations are of the same 
size—windgalls are called chévilles (predged) ; sometimes, immediately 
above the great sesamoids they mingle on the back of the tendons and 
‘form the circled windgalls. Frequently there exists also in the fold of the 
coronet, on the lateral faces of the tendons and on each side as well as on 
the median line, several small dilatations. ; 
Numerous treatments have been recommended against tendinous wind- 
