Fibrous thickening of the arterial coats and calcification are well
known lesions in the posterior aorta particularly of the horse.
Commencing in congestion or degeneration which lessens the resistance of
the vascular walls, the condition tends to dilatation, and if this is
checked by compensatory thickening, the condition of sclerosis is
induced. The combination of a slight fusiform dilatation and fibrous or
calcareous sclerosis is well known in the posterior aorta of the horse.
Unless it advances to marked aneurismal dilatation the condition is not
often recognized. If diagnosed, rest and quieting of the circulation are
especially indicated. Should it occur in other parts of the body the
symptoms would correspond to the organ invaded.
ANGEIOMA. CIRCOID ANEURISM. ANEURISM BY ANASTOMOSIS. VENOUS TUMOR.
NŒVUS.
These are forms of dilatation and elongation of the network of small
arteries, or veins, and even of the intervening capillaries. In man
these constitute the unsightly red patches and swellings that appear on
the face and hands. In animals with dark skins and hairy covering they
can only be recognized by the swelling, the feeling as of a bag of worms
when the hand is passed over it, and by the rushing sound when
auscultated. The trouble is usually subcutaneous and is essentially a
surgical one. The most promising treatment is by persistent pressure, by
electric current supplementing the pressure, by electro-puncture, and by
injections of muriate of iron. When the nœvus is not too extensive a
double thread drawn by a needle through beneath the tumor at short
intervals, then cut and each point tied separately, so as to completely
stop circulation is most effective.