Abstract #4981

PET/MRI for rectal cancer staging: Longer PET acquisition times result in increased identification of nodal metastatic disease.

Colin Burke¹, Thomas Hope¹, Michael Ohliger¹, Zhen Wang¹, Katherine Van Loon², and Madhulika G. Varma³

¹Department of Radiology & Biomedical Imaging, University of California, San Francisco, San Francisco, CA, United States, ²Gastrointestinal Oncology, The UCSF Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, ³Colorectal Surgery, University of California, San Francisco, San Francisco

Rectal cancer nodal staging guides the decision to whether neo-adjuvant chemoradiation is needed prior to surgical resection and is a predictor of survival and recurrence. However, staging based on size and morphologic criteria alone is limited. Our data suggests that increased PET acquisition times with PET/MRI increases the identification of nodal metastatic disease in rectal cancer, particularly in small nodes sized 5 mm or less.

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