Anal fissure is a wound, usually a linear or oval-shaped ulceration, several millimeters long and located at the level of the outer muco-cutaneous margin of the anus.
It can occur at any age and affects the male and female sexes equally. In 85-90% of cases it is a single, solitary lesion usually located in the posterior, while in 10 15% of cases it is localized to the anterior midline.
Anal fissures: symptoms and causes
