These may be of different kinds, as =sarcoma=, =encephaloid=, =osteoma=
and =actinomycosis=. They demand thorough surgical treatment, except
perhaps in the case of the latter, which may recover under iodide of
potassium. Emmerich records an extensive sarcoma of the orbit in a cow,
weighing six pounds and extending into the nasal sinuses, and chambers,
and implicating the cerebral meninges. Möller records cases of sarcoma
and carcinoma of the orbit in horses and dogs, and Leblanc in cattle.
Melanosarcoma is not uncommon in the orbits of gray horses which are
changing to white.
Exotoses are common around the orbits of cattle.
If such growths do not show on the surface they cause a more or less
unsightly protrusion of the eyeball, owing to the presence of the
neoplasm in the depth of the orbit, and the removal of the bulb becomes
a necessity.