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E1974. Comprehensive Review of Fat Containing Intra-Abdominal Lesions: From Common to Rare
Authors
  1. Mohammad Haroon; The Ottawa Hospital/University of Ottawa
  2. Yashmin Nisha; The Ottawa Hospital/University of Ottawa
  3. Paul Sathiadoss; The Ottawa Hospital/University of Ottawa
  4. Sabarish Narayanasamy; University of Iowa Hospitals and Clinics
  5. Nicola Schieda; The Ottawa Hospital/University of Ottawa
Background
Imaging differentials of abdominal mass lesions are broad, however detection of intralesional fat narrows down the differential diagnoses. The presence of macroscopic fat can easily be identified by Computed tomography (CT) as well as Magnetic resonance imaging (MRI) by using Frequency-selective fat suppression techniques. However, for the detection of microscopic fat, MRI is usually superior to CT, in particular chemical shift (in-phase/opposed-phase) imaging is very useful. The purpose of this exhibit is to review and illustrate the imaging features of common and uncommon fat-containing lesions of the abdomen.

Educational Goals / Teaching Points
A systematic approach to narrow down the imaging differentials will be proposed based on the anatomical location of the lesion, clinical details, and imaging features. An attempt will also be made to classify such lesions to help familiarize the readers with such lesions. Special emphasis will be given to the importance of determination of organ of origin of such lesions, as two lesions with similar imaging features but a different organ of origin can have entirely different pathology. This knowledge can impact a patient’s clinical outcome significantly.

Key Anatomic/Physiologic Issues and Imaging Findings/Techniques
This exhibit will include a compendium of cases with imaging examples from our institute, and finally an algorithmic approach will be offered to arrive at the correct diagnosis or at least narrow down the differentials to an extent to guide the clinicians with further assessment and management. A brief review of relevant MRI physics will also be incorporated in this exhibit. Our exhibit will include imaging examples of various inflammatory, neoplastic, post-traumatic, metabolic, degenerative, and congenital fat-containing lesions of solid visceral organs, gastrointestinal tract, peritoneum, retroperitoneum and mesentery. Where relevant, the complications, management, and varied presentations of different lesions will be discussed using imaging examples from our hospital as applicable.

Conclusion
Finally, conclusions and take-home messages will be provided to the readers.