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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Proctitis On the left images of a patient who presented with anal complaints. In these asbcesso the connection with the original fistula tract to the bowel is lost.

The anal sphincter is comprised of three layers: Intersphincteric fistula On the left axial T2W images with and without fat saturation.

The Radiology Assistant : Rectum – Perianal Fistulas

Secondary Iatrogenic hemorrhoideal surgery Inflammatory bowel diseases Crohn’s disease more common than colitis ulcerosa Infections viral, fungal or TB Malignancy. It relaxes during defecation. The right sided tract runs over the puborectal muscle asterisk and the mucosal opening lies at the level of the linea dentata black arrow. Case 7 Case 7.


Rectum – Perianal Fistulas

You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. This scheme corresponds to the orientation of axial MR images of the perianal region. These are absceszo often due to Crohns disease or anorectal procedures such as haemorrhoidectomy or sphincterotomy.

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Synonyms or Alternate Spellings: Primary Obstruction of anal gland which leads to stasis sbscesso infection with absces and fistula formation most common cause. Use the arrows to scroll through the images.

The most common fistulas are the intersphincteric and the transsphincteric. Sinus pilonidalis On the left an example of a sinus pilonidalis.

Case 9 Case 9. The extrasphincteric fistula is uncommon and only seen in patients who had multiple operations. There is no connection with the external sphincter. Case 8 Case 8.

The anorectal ring lies approximately ,5 cm above the linea dentata. Case 1 Case 1. Loading Stack – 0 images remaining. Two tracts in the left buttock form a single tract no.

There is a small abscess just above the nates. In pfrianal tract there is a linear structure with a low signal intensity. One ends blindly in the intersphincteric space no. About Blog Go ad-free. T2W images without fatsat better display the anatomy, while the fatsat images better depict the fistulas. These three layers are continuous cranially with the puborectal muscle and levator ani figure.


Any localizer that properly displays the anal canal can be used. If there is an extrasphincteric fistula, the lower part is opened.

In the intersphincteric space it divides again into two tracts no. An intersphincteric fistula is located at 6 o’clock.

No fistula was seen. Log in Sign up. The most widely used classification is the Parks Classification which distinguishes four kinds of fistula: On the left axial T2W images with and without fat saturation.

Surgically, the anal canal extends from the perineal skin to the anorectal ring. Distance of the mucosal defect to the perianal skin on coronal images. Case 2 Case 2. On the coronal image the fistula runs caudally towards the skin. The puborectal absceeso is contracted at rest petianal accounts for the 80? Unable to process the form. Continue with the coronal images.

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