Type III - Fibroblastic
• Exuberant granulation tissue.
• Indolent wound.
• Habronemiasis.
• Botryomycosis.
• Bacterial/fungal granulomas.
• Fibrosarcoma.
• Squamous cell carcinoma (palpebral form).
• Pythiosis in Southeast USA.
• Neurofibroma/neurofibrosarcoma.
• Angiosarcoma.
Type IV - Nodular
• Neurofibroma.
• Fibroma.
• Lymphoma.
• Melanoma.
• Mast cell tumor.
• Foreign body reaction.
• Cheloid scar.
• Nodular necrobiosis.
• Eosinophilic
collagen
dermatitis.
36
Initial symptomatic treatment
Options
• Effective therapeutic treatment options are limited.
• Success of various options varies between
individual veterinary surgeons.
• The number of sarcoids, their character,
distribution and extent have a major bearing on
the selection of treatment regimens.
• Horses in which there are a few localized lesions
are usually amenable to most sensible treatments.
Incorrect selection and application is liable to have a
poor result with a high rate of recurrence at the site
with possible extension to other sites
• It may be better not to interfere:
○ ○ Where lesions are small and few in number.
○ ○ Where lesions do not interfere with normal
function
necrosis/eosinophilic
Type V - Mixed verrucose, fibroblastic and nodular
sarcoid
• Same as the differentials for each individual type
(see above Types II, III & IV).
Type VI - Malignant
• Cutaneous
histiocytic
lymphosarcoma.
• Mycosis fungoides.
• Lymphoma.
• Ulcerative lymphangitis.
• Histoplasmosis.
• Glanders.
Treatment
and
generalized
Interference with any of the individual types may result
in marked increase of the fibroblastic component of
the mass
Radiation therapy
• By far the most successful treatment using gamma
radiation in linear interstitial brachytherapy
sources of iridium-192, radio-gold pellets
(Au198) or topical plesiotherapy radiation using
strontium-90.
• Very effective, success rates of up to 100% are
reported.
• Limited by cost and practicality.
• Feasible for small tumors around eye and other
vital areas.
• Very acceptable cosmetic results with minimum
scarring.
• Equine Health Update •