Fistula disease is usually diagnosed by a proctologist after listening to the patient’s complaints and performing a physical examination. If necessary, some additional diagnostic methods can also be applied. For example, colonoscopy, sigmoidoscopy, fistulogram, or endoscopy. In most cases, the possibility of fistula formation is determined by a detailed examination of the rectal area of patients with complaints of inflammation.
A painless examination can be done with a fistula diagnostic technique called a blue dye (methylene blue) test. In addition, one of the most commonly used methods is a detailed anoscopic examination. A procedure called rectoscopy is performed using an endoscopic device and allows other anal diseases, such as hemorrhoids and fissures, to be diagnosed along with the fistula, if any. A more detailed examination can also be carried out using a sigmoidoscopy apparatus. Thanks to the colonoscopy device, in addition to fistula disease, rectal diseases such as Crohn’s disease can be diagnosed, which may be the main cause of symptoms. Using a technique called fistulography, a blue fluid is injected through the external fistulous opening, which allows you to identify the fistulous canals that have made their way inward.