2011, Paul J. Donald, Difficult Case in Head and Neck Cancer Surgery[1], →ISBN, page 450:
Particular attention should be paid to the lingual extension on the unresected side, especially the polished surfaces, which provide additional retention and stability.
2013, Edward C. Halperin, Perez & Brady's Principles and Practice of Radiation Oncology[2], →ISBN:
Additional films can be obtained with contrast medium in the stomach and duodenal loop in unresected patients.