Perianal abscess refers to a formed infective-inflammatory collection within the perianal region. It forms part of the broader group of anorectal abscesses. No seguimento, a incidência de formação de fístula nos pacientes com abscesso perianal após a incisão e drenagem foi de 31/68 (45,58%). Perianal and perirectal abscesses are common anorectal problems. The infection originates most often from an obstructed anal crypt gland.

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Case 7 Case 7. The total length of the surgical anal canal is about cm.

The abscedso sphincter is comprised of three layers: Distance of the mucosal defect to the perianal skin on coronal images.

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Perianal abscess | Radiology Reference Article |

Infection and anal gland drainage obstruction from the perianal fistula may lead to an acute perianal abscess. These three layers are continuous cranially with the puborectal muscle and levator ani figure. Case 3 Case 3. Case 1 Case 1.

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On the left an example of a suprasphincteric fistula. Synonyms or Alternate Spellings: Primary Obstruction of abscess gland which leads to stasis and infection with absces and fistula formation most common cause. This is the Seton which was inserted to treat the fistula. Treatment is focussed on the elimination of the primary and secondary tracts, prevention of recurrence and to retain continence.


On the left axial T2W images with and without fat saturation. The treatment given depends on the anatomy of the fistula, if it is a simple fistula with a low mucosal defect is can be probed in the OR to identify the mucosal defect at the linea dentata, then the tract can be opened. It forms part of the broader group of anorectal abscesses. A perianal fistula is an abacesso connection between the epithilialised surface of the anal canal and the skin.

Secondary fistulas or abscesses. Log in Sign up. There is a small abscess just above the nates.

Protocol A localizer in three directions is needed in order to align the T2 sequences axial and coronal to the anal canal. On the coronal image the fistula runs caudally towards the skin. MR imaging classification of perianal fistulas and its implications for patient management. There are two tracts in the ischioanal region.

Perianal suppuration: results of treatment.

Intersphincteric fistula On the left axial T2W images with and without fat saturation. T2W images without fatsat better display the anatomy, while the fatsat images better depict the fistulas.


The causes of perianal fistulas:. Associations Recognised associations include: On the left coronal T2W-images of a small abscess in the left ischioanal fossa, the fistula runs through the levator ani. Support Radiopaedia and see fewer ads. Crohn’s disease On the left a patient with a abbscesso fistula who has Crohn’s disease. Reporting Pwrianal you describe a fistula, it is important to mention the following characteristics:.

The defect through the internal and external sphincter at 6 o’clock is clearly visible and more apparent on the fat sat images.

The Radiology Assistant : Rectum – Perianal Fistulas

The mucosal defect, which is by definition in the rectum, is then surgically closed. On axial and coronal MR-images the absceso layers of the anal sphincter and the surrounding structures can be displayed perfectly. A superficial fistula is a fistula that has no relation to the sphincter or the perianal glands and is not part of the Parks classification.