https://www.vetsurgeon.org/f/clinical-questions/30987/will-thymoma-removal-result-in-mega-oesophageal-symptoms-resolving A friend of mine has a middle aged collie with a mass in the anterior chest suspected to be a thymoma . Well demarcated . The dog has symptoms of MO and drooling , dropping lips and occasionally regurgitation of water . She is undecided about surgeryen-USTelligent Community 10