Kristy Lee MD, Presenter: Nothing to Disclose

Shamir Rai BSC, Abstract Co-Author: Nothing to Disclose

Kathryn Darras MD, Abstract Co-Author: Nothing to Disclose

Charlotte Jane Yong-Hing MD, FRCPC, Abstract Co-Author: Nothing to Disclose

Patrick Martin Vos MD, Abstract Co-Author: Nothing to Disclose

Cameron John Hague MD, Abstract Co-Author: Nothing to Disclose

Alison Clare Harris MBChB, Abstract Co-Author: Nothing to Disclose

Silvia D. Chang MD, Abstract Co-Author: Nothing to Disclose

Karen Sisi Lee MD, Abstract Co-Author: Nothing to Disclose

Savvas Nicolaou MD, Abstract Co-Author: Nothing to Disclose

1. Review the normal anatomy and important landmarks of the ischiorectal fossa on MRI 2. Review the MR imaging features of uncommon masses in the ischiorectal fossa and the best sequences to evaluate these masses 3. Develop a basic imaging approach that will help narrow the differential diagnosis

-Historical imaging approach and misconceptions of the ischiorectal fossa (IRF) -Normal anatomy and important landmarks of the IRF and anorectum -Utility and limitations of MR sequences for characterizing neoplasms -Ddx based on location: arising from the anorectum (intraluminal, intra-luminal and extra-luminal, intramural or extra-luminal), IRF, or rectal extra-peritoneal space extending into the IRF and intimately or not related to the sacrococcygeus -Narrow the ddx based on tissue type and tumor composition -Review what surgeons and oncologists want to know -Discuss an imaging-based algorithm for evaluation and management with cases including rectal carcinoid, leiomyosarcoma, leiomyoma, primary rectal lymphoma, metastases, GIST, lipomas, liposarcoma, myxoid liposarcoma, aggressive angiomyxoma, mucinous adenocarcinoma (and arising from perianal fistulae), plexiform neurofibromas, schwannoma, malignant nerve sheath tumor, teratoma and chordoma, mimics such as pilonidal cyst disease, cystic lympangioma, etc.

http://abstract.rsna.org/uploads/2014/14016751/14016751_1q83.pdf

Lee, K, Rai, S, Darras, K, Yong-Hing, C, Vos, P, Hague, C, Harris, A, Chang, S, Lee, K, Nicolaou, S, Beyond Adenocarcinoma—An MR Imaging Approach to Uncommon Neoplasms of the Ischiorectal Fossa.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14016751.html