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 the coronal image the fistula runs caudally towards the skin. Pathology Infection and anal gland drainage obstruction from the perianal fistula may lead to an acute perianal abscess.

Perianal suppuration: results of treatment.

Case 4 Case 4. The anatomical anal canal extends from the perineal skin to the linea dentata.

This patient was already known to have an intersfincteric fistula, the mucosal defect is at 1 o’clock. On the left an example of a suprasphincteric fistula.

The anorectal ring lies approximately ,5 cm above the linea dentata. Associations Recognised associations include: Sinus pilonidalis On the left an example of a sinus pilonidalis. Treatment is focussed on the elimination of the primary and secondary tracts, prevention of recurrence and to retain continence. Loading Stack – 0 images remaining. Surgically, the anal canal extends from the perineal skin to the anorectal ring. Primary Obstruction of anal gland which leads to stasis and infection with absces and fistula formation most common cause.


Support Radiopaedia and see fewer ads. It relaxes during defecation. Abscess in the Ischioanal space An abscess in the ischioanal space with no connection to the sphincter complex. Protocol A localizer in three directions is needed in order to align the T2 sequences axial and coronal to the anal canal. Articles Cases Courses Quiz.

No fistula was seen. Crohn’s disease On the left a periana, with a perianal fistula who has Crohn’s disease. Case 5 Case 5. T2W images without fatsat better display the anatomy, while the fatsat images better depict the fistulas. On the left axial T2W-fatsat images of a transsphincteric fistula with the mucosal opening at 11 o’clock.

This is the circular upper border of the puborectal muscle which is digitally palpable upon rectal examination.

Perianal abscess | Radiology Reference Article |

The puborectal muscle is contracted at rest and accounts for the 80? There is no connection with the external sphincter. Position of the mucosal opening on axial images using the anal clock. On the left coronal T2W-images of a small abscess in the left ischioanal fossa, the fistula runs through the levator ani. There is a small abscess just above the nates. MR imaging classification of perianal fistulas abscssso its implications for patient management.


In the tract there is a linear structure with a low signal intensity.

Rectum – Perianal Fistulas

Log in Sign up. Extrasphincteric fistula On the left coronal T2W-images of a small abscess in the left abcesso fossa, the fistula runs through the levator ani. On axial and coronal MR-images the different layers of the anal sphincter and the surrounding structures can be displayed perfectly.

The extrasphincteric fistula is uncommon and only seen in patients who had multiple operations.

On the left a patient with a perianal fistula who has Crohn’s disease. 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. Secondary fistulas or abscesses.