[Perianal glands of Hermann and their pathology. Review of the literature. Apropos of a cyst case].

We present a case report of a cyst of Herrmann's glands. These glands have a vestigial origin and are present in more than 50% of the population. They are located in the posterior part of the anal duct. Their excretory duct, when it is permeable communicates with an anal krypt. They have their own microscopic, epithelial characteristics, and produce a mucoid secretion. They can cause acute (abscess) or chronic (fistula) infections of the peri-ano-rectal region. Cancer or cystic transformations are exceptional but typical. All these characteristics are so specific that Herrmann's glands cannot be longer denied as a distinct clinical entity.