If the patient is asymptomatic and the mass is identified based upon radiologic findings, biopsy and/or resection may be avoided. Surgical removal of the mass is the definitive treatment for<unk>  tissue that is causing symptoms. It has been reported that the<unk>  tissue can transform into cancerous tissue. However, due to most diagnosed<unk>  tissue being resected due to this concern, the natural progression is not well explored. The data supporting malignant transformation is limited, and<unk>  tissue that is not causing problems can likely be left to involute. Given the<unk> 's role in the body's adaptive immune system, it should be confirmed that the patient has a mediastinal<unk>  prior to surgery in order to prevent the potential for future immunodeficiencies.
Ectopic thymus
Abscess of thymus
Cervical thymic cyst
Tracheal agenesis
Persistent thyroglossal duct
Salivary gland atresia
Ectopic salivary gland tissue
Salivary gland aplasia