A sinus tract is an asymmetrical type of passageway that leads from within the bones to the surface of the skin. This channel is also called a fistula. It can also be said as a drainage pathway from a deep focus of acute infection through tissue and/or bone to an opening on the surface.
A contagion or a decompression of a synovial joint in rheumatoid arthritis or common fistulous rheumatism can also lead to a formation of Sinus tracts.
When a profound disease develops, the body restrains the disease, stopping it from contaminating the bloodstream. Pus develops in the area that is weak. As it continues to develop, a slender channel is formed in the weak spot. In time, the channel reaches the surface of the skin, where it bursts. When the pus burst the pressure is also relieved thus the patient feels less pain and may not have any fever Sometimes we see that an infection develops in a long bone and it worsens, over months. Ultimately the infection gets to the skin, forming a sinus.
A sinus tract is a small uncharacteristic channel in the body. A tract usually goes from the cause of infection to the skin's surface. A sinus can be developed after an abscess is cleared (by itself or by medical treatment), then one of more of the small openings (tracts) connect the cavity to the skin surface. But in some cases some people can develop a pilonidal sinus without ever having a pilonidal abscess.
Occasionally draining cutaneous sinus tracts in the area of the face and neck may be caused by chronic dental infection. Intraoral sinus tracts owing to dental infections are quite widespread. Nasal dermoid sinus cysts are very widespread congenital midline nasofrontal masses, but on clinical inspection they are very easily misinterpreted to be sinusitis. Sinus tracts are best demonstrated on MR imaging. Small tracts, however, may be difficult to find. T1 weighted images with intravenous gadolinium may be more sensitive in finding smaller abscesses and sinus tracts.
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