Rhinitis causing the rhinitis. Rhinitis medicamentosa is a form of drug-induced nonallergic rhinitis which is associated with nasal congestion brought on by the use of certain oral medications (primarily sympathomimetic amine and 2-imidazoline derivatives) and topical decongestants (e.g., oxymetazoline, phenylephrine, xylometazoline, and naphazoline nasal sprays) that constrict the blood vessels in the lining of the nose. Chronic rhinitis is a form of atrophy of the mucous membrane and glands of the nose. Chronic form of dryness of the mucous membranes. Chronic rhinitis associated with polyps in the nasal cavity. Most prominent pathological changes observed are nasal airway epithelial metaplasia in which
Equine nasal cysts benign, the prognosis for a complete recovery is extremely good, and the rate of any recurrence is minimal. Some horses may have a mild mucous discharge after surgery, which can be permanent, but this does not generally seem to cause problems. However, if the cyst does transpire to be malignant, the prognosis becomes worse, with roughly 70% survival, as opposed to a norm of more than 95% with benign cysts. Ethmoid hematoma Equine nasal cysts Equine nasal cysts are epithelium lined, single or loculated cavities filled with fluid or pus. They normally form in the ventral concha, maxillary sinuses, and