urachal fistula

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Related to urachal fistula: patent urachus, Urachal cyst, urachal ligament

u·ra·chal fis·tu·la

an abnormal passage or fistula between the urinary bladder and the umbilicus.


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.

blind fistula
one open at one end only, opening on the skin (external blind fistula) or on an internal surface (internal blind fistula).
branchial fistula
a persisting branchial cleft.
complete fistula
one extending from the skin to an internal body cavity.
craniosinus fistula
one between the cerebral space and one of the sinuses, permitting escape of cerebrospinal fluid into the nose.
crop fistula
the crop communicates with the skin on the neck of the bird.
enterocutaneous fistula
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.
esophageal fistula
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.
Enlarge picture
Esophageal fistula. By permission from Knottenbelt DC, Pascoe RR, Diseases and Disorders of the Horse, Saunders, 2003
fecal fistula
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.
gastric fistula
an abnormal passage communicating with the stomach; often applied to an artificially created opening, through the abdominal wall, into the stomach.
horseshoe fistula
a semicircular fistulous tract about the anus, with both openings on the skin.
incomplete fistula
blind fistula.
lateral cervical fistula
see branchial cyst.
oroantral fistula
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.
oronasal fistula
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.
ruminal fistula
created surgically in left upper flank. May occur accidentally due to persistence of trocar puncture for treatment of bloat.
salivary fistula
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.
umbilical fistula
an abnormal passage communicating with the gut or the urachus at the umbilicus.
urachal fistula
persistence of the urachal canal with communication between the urinary bladder and umbilicus. See also persistent urachus.