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a pathologic communication between the oral cavity and the nasal cavity.
or·o·na·sal fis·tu·la(ōrō-nāzăl fistyū-lă)
Pathologic communication between oral and nasal cavity.
pl. fistulae, fistulas; any abnormal, tubelike passage within body tissue, usually between two internal organs, or leading from an internal organ to the body surface. Some fistulae are created surgically, for diagnostic or therapeutic purposes; others occur as a result of injury or as congenital abnormalities. See also arteriovenous fistula.
one open at one end only, opening on the skin (external blind fistula) or on an internal surface (internal blind fistula).
a persisting branchial cleft.
one extending from the skin to an internal body cavity.
one between the cerebral space and one of the sinuses, permitting escape of cerebrospinal fluid into the nose.
the crop communicates with the skin on the neck of the bird.
one in which there is communication between the intestinal tract and the skin. Some fistulae are created surgically, with gastrostomy, esophagostomy or colostomy. Others may result from surgical trauma, breakdown of an intestinal anastomosis, or erosions around a surgical drain or tube.
communication between the esophagus and some portion of the respiratory tract, e.g. trachea, bronchi or pulmonary tissue. May be congenital or acquired as a result of trauma or inflammatory lesions, particularly esophageal foreign bodies.
a colonic fistula opening on the external surface of the body and discharging feces.
foreign body fistula
remnant of a foreign body impalation or a grass seed are the common causes. Fistula drains continuously.
an abnormal passage communicating with the stomach; often applied to an artificially created opening, through the abdominal wall, into the stomach.
a semicircular fistulous tract about the anus, with both openings on the skin.
lateral cervical fistula
see branchial cyst.
between the oral cavity and a sinus. In dogs, usually involves the maxillary sinus and is caused by periodontal disease of the fourth premolars and first molars.
between the nasal and oral cavities. Occurs most commonly in dogs with advanced periodontal disease of the maxillary canine tooth, but can result from disease of canines and premolars. It may also occur after tooth extraction, particularly in dogs, leading to the passage of food into the nasal cavity and a secondary chronic rhinitis and nasal discharge.
created surgically in left upper flank. May occur accidentally due to persistence of trocar puncture for treatment of bloat.
usually discharges saliva on to the side of the face but may discharge into the mouth. Usually due to laceration of the duct by trauma.
an abnormal passage communicating with the gut or the urachus at the umbilicus.
persistence of the urachal canal with communication between the urinary bladder and umbilicus. See also persistent urachus.