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Pilonidal sinus (PNS): is a sinus tract, or small channel, that may originate from the source of infection and open to the surface of the skin. [10] Material from the cyst drains through the pilonidal sinus. A pilonidal cyst is usually painful, but if it is a draining sinus, the pressure is relieved and patient might not feel pain.
This is a shortened version of the twelfth chapter of the ICD-9: Diseases of the Skin and Subcutaneous Tissue. It covers ICD codes 680 to 709 . The full chapter can be found on pages 379 to 393 of Volume 1, which contains all (sub)categories of the ICD-9.
Perianal cellulitis, also known as perianitis or perianal streptococcal dermatitis, is a bacterial infection affecting the lower layers of the skin around the anus. [1] [2] [3] It presents as bright redness in the skin and can be accompanied by pain, difficulty defecating, itching, and bleeding.
Anorectal abscess (also known as an anal/rectal abscess or perianal/perirectal abscess) is an abscess adjacent to the anus. [1] Most cases of perianal abscesses are sporadic, though there are certain situations which elevate the risk for developing the disease, such as diabetes mellitus, Crohn's disease, chronic corticosteroid treatment and others.
The final structure of the abscess is an abscess wall, or capsule, that is formed by the adjacent healthy cells in an attempt to keep the pus from infecting neighboring structures. However, such encapsulation tends to prevent immune cells from attacking bacteria in the pus, or from reaching the causative organism or foreign object. [26]
Potential complications include abscess formation. [1] Around 95% of people are better after 7 to 10 days of treatment. [2] Those with diabetes, however, often have worse outcomes. [10] Cellulitis occurred in about 21.2 million people in 2015. [7] In the United States about 2 of every 1,000 people per year have a case affecting the lower leg. [1]
Treatment is with antibiotics and drainage of the abscess; typically guided by ultrasound or CT, through the skin, via the rectum, or transvaginal routes. [3] Occasionally antibiotics may be used without surgery; if the abscess is at a very stage and small. [2] Until sensitivities are received, a broad spectrum antibiotic is generally required. [2]
Anal fistula is a chronic abnormal communication between the anal canal and the perianal skin. [1] An anal fistula can be described as a narrow tunnel with its internal opening in the anal canal and its external opening in the skin near the anus. [2]