A fistula between the maxillary sinus and the oral cavity.
An abnormal passage or communication leading from an internal organ to the surface of the body.
Abnormal communication most commonly seen between two internal organs, or between an internal organ and the surface of the body.
Abnormal passage communicating with the STOMACH.
An abnormal passage in the oral cavity on the gingiva.
An abnormal direct communication between an artery and a vein without passing through the CAPILLARIES. An A-V fistula usually leads to the formation of a dilated sac-like connection, arteriovenous aneurysm. The locations and size of the shunts determine the degree of effects on the cardiovascular functions such as BLOOD PRESSURE and HEART RATE.
An abnormal anatomical passage between the INTESTINE, and another segment of the intestine or other organs. External intestinal fistula is connected to the SKIN (enterocutaneous fistula). Internal intestinal fistula can be connected to a number of organs, such as STOMACH (gastrocolic fistula), the BILIARY TRACT (cholecystoduodenal fistula), or the URINARY BLADDER of the URINARY TRACT (colovesical fistula). Risk factors include inflammatory processes, cancer, radiation treatment, and surgical misadventures (MEDICAL ERRORS).
An abnormal passage or communication between a bronchus and another part of the body.