<unk>  is a benign thymic neoplasm located in the anterior mediastinum, behind the sternum and in front of the great vessels that involutes during puberty, it takes part in lymphocytes maturation throughout adulthood.
The incidence of<unk>  is approximately 0.13 per 100,000 individuals.
Thymic neoplasm can be divided into two major groups:<unk>  and thymic carcinomathymoma<unk>  is the most common tumor of the anterior mediastinum, consisting of any type of thymic epithelial cell as well as lymphocytes that are usually abundant and probably not neoplastic.<unk>  usually is benign, and frequently encapsulated uncommon tumor, best known for its association with the autoimmune disorder such as myasthenia gravis.<unk>  is found in 15% of patients with myasthenia gravis.
Once diagnosed,<unk> s may be removed surgically.  If left untreated<unk>  may progress to invade the mediastinum and the surrounding structure.
Depending on the stage of the tumor at the time of diagnosis, the prognosis may vary. However, the prognosis is generally regarded as good.
Common complications of the<unk>  include the pressure effect of the mass itself, autoimmune diseases, and rarely, malignancy.  Metastasis is extremely rare. In the rare case of a malignant tumor, chemotherapy may be used.
Malignant lymphomas that involve the thymus, e.g., lymphosarcoma, Hodgkin's disease (termed "granulomatous<unk> " in the past), should not be regarded as<unk> .<unk> s associated with autoimmune disorders usually are benign. Malignant<unk> s can metastasize, generally to pleura, kidney, bone, liver, or brain.
Thymoma
Thyroid nodule
Lymphoma
Thyroid adenoma
Thyroid cancer
Thymic carcinoma
Lung abscess
Goitre