The _tuberculous sinus_ is described under Tuberculosis.
A #fistula# is an abnormal canal passing from a mucous surface to the
skin or to another mucous surface. Fistulae resulting from suppuration
usually occur near the natural openings of mucous canals--for example,
on the cheek, as a salivary fistula; beside the inner angle of the eye,
as a lacrymal fistula; near the ear, as a mastoid fistula; or close to
the anus, as a fistula-in-ano. Intestinal fistulae are sometimes met with
in the abdominal wall after strangulated hernia, operations for
appendicitis, tuberculous peritonitis, and other conditions. In the
perineum, fistulae frequently complicate stricture of the urethra.
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