Perianal Fistula and Abscess: An Imaging Guide for Beginners

An applicability study of rapid artificial intelligence-assisted compressed sensing (ACS) in anal fistula magnetic resonance imaging

“…In this study, to compare the diagnostic effectiveness of anal fistulas with surgical results, careful evaluation of the following data was performed on a dedicated workstation by senior radiologists: direction of fistula (whether simple or branching), internal opening, and distance between the internal opening and anal verge (location). The direction of the fistula was identified on axial images using the ‘‘anal clock’’ [ 2 ]. Moreover, the categories of anal fistula were evaluated according to Parks' classification (Grade1, intersphincteric fistula; grade 2, transsphincteric fistula; grade 3, suprasphincteric fistula; and grade 4, extrasphincteric fistula) [ 3 ].…”

“…Optimal treatment requires detailed preoperative imaging information, including the location of the fistula and affected pelvic structure. Assessment of fistula characteristics, such as fistula classification, detection, and direction of the internal opening, as well as any secondary site that may extend or form an abscess, are essential for accurate management [ 2 , 3 ].…”

Incidence and diagnostic performance of ultrasound for perianal abscess or fistula‐in‐ano in pediatric patients with perianal inflammation

“…Perianal abscess is characterized by a fluid collection within the subcutaneous tissue (Figures 2–4). 16,18,19 Additionally, the maximum diameter of the perianal abscess was recorded. Fistula‐in‐ano is characterized by a hypoechoic linear tract running from the proximal side of the dermis (Figures 5 and 6) or abscess (Figures 2 and 4) to the distal side running into the anal tract 12,20,21 …”