What was the result of the first study he had done? The biggest issue after I lost half my tongue was moving food to the back of my mouth so that I could swallow, but once I got it there I was okay. Since he hasn't had radiation yet he should still have a good coughing reflex if he is aspirating, so the fact that he's not coughing is a great sign. If he did aspirate he'd also risk pneumonia and the fact that he hasn't is another great sign. Get another study done and if he passes that feed him and fatten him up before he starts treatment. The treatment is tough at any age but especially tough on the elderly. Good luck to you and your Dad!!