Existence inferential with similar external tumors. Cholesterine
tumors on plexus of lateral, third or fourth ventricle: pea to egg: in
old; concentric layers with abundant exudate. Symptoms: slight, or
excitability, dullness, vertiginous paroxysms with sudden congestions,
as in encephalitis, sopor, stupor, paresis, coma. Melanoma: mainly
meningeal; pea to walnut; with skin melanomata in gray or white
horses. Cases. Pigmented sarcomata. Diagnosis, inferential. Psammoma:
advanced cholesteatoma, melanoma, fibroma, etc.: osteid tumors.
Nervous irritation, delirium, spasms, nervous disorder, and paroxysms.
Myxoma: contains mucin: cells (in homogeneous matrix) round,
spindle-shaped or stellate. Changes to fat (cholesterin). Œdematous
connective tissue, neoplasm. Myxolipoma. Myxo-cystoid. Symptoms.
Tumors in the brain are not marked by distinct pathognomonic symptoms,
so that their presence is to be inferred as a probability rather than
pronounced upon as a certainty.
The most common forms in the horse are cholesterine (cholesteatoma),
melanotic (melanoma), sandy, gritty (psammoma), and fibrous (fibroma).