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INFLAMMATION OF THE SALIVARY GLANDS. 
Differential diagnosis. Parotitis may easily be mistaken at the 
commencement for swelling of the sub-parotideal lymph gland, which 
does not, however, remain confined to the parotid region, but is more 
diffused. From distension of the guttural pouches parotitis is dis¬ 
tinguished by the presence of inflammation, and by the absence of the 
puiulent nasal discharge which is so diagnostic of disease of the guttural 
pouch. Tumours in the parotid region are unaccompanied by inflam¬ 
mation, and never develop so rapidly as the swelling of parotitis. The 
submaxillary and sublingual glands also become diseased, but less 
frequently. Parotitis usually originates in the mucous lining of the 
ducts, the inflammation extending from catarrhal conditions of the buccal 
membrane. Outbreaks of an enzootic type are recorded in horses. A 
long flattish swelling appears in the throat, which extends under the 
parotid, and salivation is present. The termination of Wharton’s duct 
on the septum linguae not infrequently appears stopped. Should pus 
formation result, the abscess commonly breaks into the mouth, less 
frequently externally, but in fourteen days convalescence is established. 
The abscesses so often seen in the laryngeal region in oxen are almost 
always the result of injury to the tongue or lower portion of the cavity 
of the mouth and local infection. 
Stockfleth has described, under the name of “ranula,” a disease in 
cows, which presents the appearances of virulent inflammation of the 
submaxillary gland. There is oedema of the throat, and an elastic 
swelling as large as a hen’s egg is found on the framum lingua. If this 
be opened early, the symptoms soon disappear, but if not, the head and 
neck rapidly swell, and bieathing and swallowing are so disturbed that 
the animals often die in a few days. 
Inflammation and abscess formation occur in the ducts of the salivary 
glands, especially in Stenson s and TVliarton’s ducts. Meyer found in 
Stenson’s duct in a horse a spikelet of Timothy grass. Concretions may 
also inflame the gland duct, producing pus formation and salivary fistula. 
Foreign bodies in the duct can often be removed by pressure in the 
direction of the buccal opening; if this fail the duct must be incised. 
Cattle, especially in low-lying situations, are liable to chronic inflammation 
of the parotid glands ascribed by Stockfleth to bad pastures, but his descrip¬ 
tion rather points to actinomycosis or some musculo-fibromatous condition 
In such cases inflammatory appearances develop slowly; hard, indurated,* 
slightly painful swellings first appear, scarcely increasing the size of the part 
but later abscesses form and discharge a thick pus; the adjoining lymph 
glands swell, contributing to the serious difficulty in breathing and swallowing 
which finally sets m. The patients rapidly go back in condition, and are 
disfigured by the formation of salivary fistulae. Even with liberal feeding 
complete recovery is uncertain, and it is generally desirable to prepare the 
animals for slaughter. _ Tlnernesse described a disease in dogs similar to 
parotitis, but withstanding all ordinary curative methods, and for which he 
