Pinguecula: fatty growth: Lipoma: Melanoma: Dermoid tumor in young
dogs, calves, sheep. Cocainize the part and excise. Cold water: silver
nitrate. Polypus. Pterygium.
A pale fatty looking elevation on the sclerotic at the inner side of the
cornea is not unknown in the dog, resembling =pinquecula= of man. It has
not been seen to prove harmful and may be safely ignored.
=Lipoma= has also been observed (Müller) and when troublesome may be
removed by excision with scissors.
=Melanosis= is met with in gray horses in connection with the same
disease of the skin of the lids, and usually with generalized pigment
tumors. In the latter case surgical interference is useless unless it is
to secure a very temporary relief.
=Dermoid Tumor of the Conjunctiva.= This consists in a cutaneous
product, consisting externally of a mass of epidermic cells, beneath
which are connective tissue, fat cells, and muscular fibres, glands and
growing hairs. It usually extends inward from the outer portion of the
sclerotic conjunctiva and may encroach on that of the cornea. It is
firmly adherent to the sclera, and sometimes to the cornea by its base
and deeper aspect, but the apex is free and more or less projecting. The
color is yellow, or more or less blackened by pigment or even reddened
by blood. It has been observed, above all, in dogs, Prince reports a
case in a calf and Zundel in a sheep. The Cornell Veterinary College
clinic has furnished cases in ox and dog. They have, however, nearly
always been seen in young animals and are probably congenital.
These are easily removed from the eye anæsthetized by a 4 per cent.
solution of chloride of cocaine. The inner projecting end of the tumor
is seized by rat-tooth forceps, and carefully snipped off with sharp
scissors curved on the flat. Where adherent to the cornea it must be
carefully handled, but where attached to the thicker and more resistant
sclerotic it can be dealt with more freely. A pencil of silver nitrate
may be used to check the bleeding, or that may be effected by cold water
freely applied.
=Polypus=, a small, pale, pediculated tumor of the conjunctiva is
described by Lafosse and should be removed by scissors, and bleeding
checked by cold, wet applications.