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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On axial and coronal MR-images the different 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. The most widely used classification is the Parks Classification which distinguishes four kinds of fistula: Position of the mucosal opening on axial images using the anal clock.

Secondary fistulas or abscesses. Use the arrows to scroll through the images. The defect through the internal and external sphincter at 6 o’clock is clearly visible and more apparent on the fat sat images.

Periansl the left coronal images of another patient with an intersphincteric fistula.

Perianal abscess | Radiology Reference Article |

About Blog Go ad-free. Complex fistula On the left an example of a complex fistula. Loading Stack – 0 images remaining. This is only possible if the external sphincter is not involved.

Continue with coronal images. Axial fatsat images depict the transmural inflammation with infiltration of the mesenteric fat.


Perianal suppuration: results of treatment.

The drawing on the left illustrates the anal clock, which is the surgeon’s view of the perianal region when the patient is in the supine lithotomy position 2. The perianall of perianal fistulas: This has the advantage that the muscle is slowly cut and fibroses at the same time in order to cause as little damage as possible to the sphincter complex. There is a small abscess just above the nates.

On the left an example of a complex fistula. This scheme corresponds to the orientation of axial MR images of the perianal region. Protocol A localizer in three directions is needed in absceszo to align the T2 sequences axial and coronal to the anal canal. Synonyms or Alternate Spellings: This is the circular upper border of abscessso puborectal muscle which is digitally palpable upon rectal examination.

The anorectal ring lies approximately ,5 cm above the linea dentata. Edit article Share article View revision history.

Rectum – Perianal Fistulas

Infection and anal gland drainage peroanal from the perianal fistula may lead to an acute perianal abscess. There is, however, a diffuse thickening of the rectal mucosa due to a proctitis.

There is no relation with the sphincter complex. No fistula was seen. It relaxes during defecation. In these cases the connection with the original fistula tract to the bowel is lost. If there is an extrasphincteric fistula, the lower part is opened.

Two tracts in the left buttock form a single tract no. This patient was already known to have an intersfincteric fistula, the mucosal defect is at 1 o’clock. The abscesdo 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. Case perrianal Case 2. On the left axial T2W-fatsat images of a transsphincteric fistula with the mucosal opening at 11 o’clock.


It is therefore above the sphincter complex and extrasphincteric. Surgically, the anal canal extends from the perineal skin to the anorectal ring.

Treatment is focussed on the elimination of the primary and secondary tracts, prevention of recurrence and to retain continence. Unable to process the form.

The mucosal defect, which is by definition in the rectum, is periamal surgically closed. In the tract there is a linear structure with a low signal intensity. MR imaging classification of perianal fistulas and its implications for patient management.

The total length of the surgical anal canal is about cm. This is the Seton which was inserted to treat the fistula. Case 6 Case 6. The anal sphincter is comprised of three layers: