Various types of<unk> s include: * Blind: Only one open end; may also be called sinus tracts. * Complete: Both internal and external openings. * Incomplete: An external skin opening that does not connect to any internal organ. Although most<unk> s are in forms of a tube, some can also have multiple branches. Location Types of<unk>  can be described by their location. Anal<unk> s connect between the epithelialized surface of the anal canal and the perianal skin. Anovaginal or rectovaginal<unk> s occur when a hole develops between the anus or rectum and the vagina. Colovaginal<unk> s occur between the colon and the vagina. Urinary tract<unk> s are abnormal openings within the urinary tract or an abnormal connection between the urinary tract and another organ such as between the bladder and the uterus in a vesicouterine<unk> , between the bladder and the vagina in a vesicovaginal<unk> , and between the urethra and the vagina in urethrovaginal<unk> . When occurring between two parts of the intestine, it is known as an enteroenteral<unk> , between the small intestine and the skin as an enterocutaneous<unk> , and between the small intestine and the colon as a colocutaneous<unk> . The following list is sorted by the International Statistical Classification of Diseases and Related Health Problems. H: Diseases of the eye, adnexa, ear, and mastoid process * (H04.6) Lacrimal<unk>  * (H05.81) Carotid cavernous<unk>  * (H70.1) Mastoid<unk>  * Craniosinus<unk> : between the intracranial space and a paranasal sinus * (H83.1) Labyrinthine<unk>  * Perilymph<unk> : tear between the membranes between the middle and inner ears * Preauricular<unk>  * Preauricular<unk> : usually on the top of the cristae helicis of the ears I: Diseases of the circulatory system * (I25.4) Coronary arteriovenous<unk> , acquired * (I28.0) Arteriovenous<unk>  of pulmonary vessels * Pulmonary arteriovenous<unk> : between an artery and vein of the lungs, resulting in shunting of blood. This results in improperly oxygenated blood. * (I67.1) Cerebral arteriovenous<unk> , acquired * (I77.0) Arteriovenous<unk> , acquired * (I77.2)<unk>  of artery J: Diseases of the respiratory system * (J86.0) Pyothorax with<unk>  * (J95.0) Tracheoesophageal<unk> , between the trachea and the esophagus. This may be congenital or acquired, for example as a complication of a tracheostomy. K: Diseases of the digestive system Duodeno Biliary<unk>  * (K11.4) Salivary gland<unk>  * (K31.6)<unk>  of stomach and duodenum * (K31.6) Gastrocolic<unk>  * (K31.6) Gastrojejunocolic<unk>  – after a Billroth II a<unk>  forms between the transverse colon and the upper jejunum (which, post Billroth II, is attached to the remainder of the stomach). Fecal matter passes improperly from the colon to the stomach and causes halitosis. * Enterocutaneous<unk> : between the intestine and the skin surface, namely from the duodenum or the jejunum or the ileum. This definition excludes the<unk> s arising from the colon or the appendix. * Gastric<unk> : from the stomach to the skin surface * (K38.3)<unk>  of appendix * () Anal and rectal fissures and<unk> s * () Anal<unk>  * () Anorectal<unk>  (fecal<unk> ,<unk> -in-ano): connecting the rectum or other anorectal area to the skin surface. This results in abnormal discharge of feces through an opening other than the anus. * (K63.2)<unk>  of intestine * Enteroenteral<unk> : between two parts of the intestine * (K82.3)<unk>  of gallbladder * (K83.3)<unk>  of bile duct * Biliary<unk> : connecting the bile ducts to the skin surface, often caused by gallbladder surgery * Pancreatic<unk> : between the pancreas and the exterior via the abdominal wall M: Diseases of the musculoskeletal system and connective tissue * (M25.1)<unk>  of joint N: Diseases of the urogenital system * (N32.1) Vesicointestinal<unk>  * (N36.0) Urethral<unk>  * Innora:between the prostatic utricle and the outside of the body * (N64.0)<unk>  of nipple * (N82)<unk> e involving female genital tract / Obstetric<unk>  * (N82.0) Vesicovaginal<unk> : between the bladder and the vagina * (N82.1) Other female urinary-genital tract<unk> e * Cervical<unk> : abnormal opening in the cervix * (N82.2)<unk>  of vagina to small intestine * Enterovaginal<unk> : between the intestine and the vagina * (N82.3)<unk>  of vagina to large intestine * Rectovaginal: between the rectum and the vagina * (N82.4) Other female intestinal-genital tract<unk> e * (N82.5) Female genital tract-skin<unk> e * (N82.8) Other female genital tract<unk> e * (N82.9) Female genital tract<unk> , unspecified Q: Congenital malformations, deformations and chromosomal abnormalities * (Q18.0) Sinus,<unk>  and cyst of branchial cleft * Congenital preauricular<unk> : A small pit in front of the ear. Also known as an ear pit or preauricular sinus. * (Q26.6) Portal vein-hepatic artery<unk>  * (Q38.0) Congenital<unk>  of lip * (Q38.4) Congenital<unk>  of salivary gland * (Q42.0) Congenital absence, atresia and stenosis of rectum with<unk>  * (Q42.2) Congenital absence, atresia and stenosis of anus with<unk>  * (Q43.6) Congenital<unk>  of rectum and anus * (Q51.7) Congenital<unk> e between uterus and digestive and urinary tracts * (Q52.2) Congenital rectovaginal<unk>  T: External causes * (T14.5) Traumatic arteriovenous<unk>  * (T81.8) Persistent postoperative<unk>
Fistula
Fecal impaction
Intestinal ischemia
Defecation
Vesicointestinal fistula
Bowel obstruction
Organ perforation
Evisceration 