Horseshoe anorectal abscesses — those that cross the midline — present a distinct and challenging management problem. Their anatomical extent, involving the deep postanal space and bilateral ischiorectal spaces, demands a targeted operative strategy that differs from standard approaches.

Clinical scenario

This protocol applies to a horseshoe anorectal abscess crossing the midline that involves the deep postanal space and extends laterally into the ischiorectal spaces. These abscesses can be challenging to manage and require careful selection of operative technique.

Treatment approach (partial overview)

Management centres on operative drainage that specifically addresses both the deep postanal space and the lateral ischiorectal extensions. Certain drainage techniques are favoured over others in this setting — primary lay-open approaches are typically not appropriate here. The structured protocol specifies the operative options and their comparative considerations.

References

DOI: 10.1097/DCR.0000000000002473

Abscesses that cross the midline (ie, horseshoe) can be challenging to manage.
These abscesses most often involve the deep postanal space and extend laterally into the ischiorectal spaces.
Under these circumstances, primary lay-open fistulotomy should typically be avoided because these fistulas tend to be transsphincteric.
The Hanley procedure, a technique that drains the deep postanal space and uses counter incisions to address the ischiorectal spaces, is effective in the setting of a horseshoe abscess, although it may negatively impact anal sphincter function.
A modified Hanley technique using a posterior midline partial sphincterotomy to unroof the postanal space plus seton placement has a high rate of abscess resolution and has been reported to better preserve anorectal function compared to other operative interventions.

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Treatment of Horseshoe Anorectal Abscess Crossing the Midline

References