Alessandra Casale, Presenter: Nothing to Disclose

Flaminia De Cristofaro, Abstract Co-Author: Nothing to Disclose

Marina De Vargas Macciucca MD, Abstract Co-Author: Nothing to Disclose

Fabrizio Fiore, Abstract Co-Author: Nothing to Disclose

Giuseppe Panzironi MD, Abstract Co-Author: Nothing to Disclose

The aim of this study is to evaluate the diagnostic accuracy of endoanal ultrasonography (EAUS) in the preoperative classification of fistula in ano

Preoperative EAUS was performed on 41 patients with suspected simple or complex anal fistulas, using biplane probe, linear or convex, and rotating probe with a 360° radius. Evaluation of primary and secondary tracts, fluid collection (perianal abscesses), and internal opening. Hydrogen peroxide has been used in presence of external openings. Fistula in ano were (have been) classified according to Parks’ classification. All patients underwent surgery. Surgical findings were compared with EAUS results

EUAS correctly identified the fistula tract in 37 cases (95%). Sensitivity and accuracy, respectively, 97.5% and 97.6%. In simple anal fistulas the agreement between EAUS and surgery was 100%. In complex anal fistulas EAUS identified secondary tracts and abscesses in 75% and 85% of cases, respectively. Internal opening was identified in 89% of cases

The accurate preoperative definition of the anatomy of the tract is essential for surgical planning. EAUS is a very useful diagnostic exam in the preoperative evaluation and classification of fistula in ano, simple or complex

EAUS is a very useful diagnostic exam in the preoperative evaluation and classification of fistula in ano, simple or complex.

Casale, A, De Cristofaro, F, De Vargas Macciucca, M, Fiore, F, Panzironi, G, Endoanal Ultrasonography in the Pre-operative Classification of Fistula in Ano.  Radiological Society of North America 2008 Scientific Assembly and Annual Meeting, February 18 - February 20, 2008 ,Chicago IL. http://archive.rsna.org/2008/6016873.html