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May 02,  · An enlarged thymus gland can occur for a number of reasons, including simple overgrowth of thymus tissue, which is found in some autoimmune disorders where the body's immune system attacks itself. Other causes of enlargement are: cysts, benign tumors and cancers. The thymus gland normally grows until an individual reaches puberty. First, it may be a result of the constitutional defect shown by increased vagus tone, deficiency of the chromaffin system, and weakness of the sympathetic system. Second, it may be a result of hypersusceptibility to physical and chemical agents. Third, it may be a result of cum-xxx.xyz: Howard P. Doub.

Thymic hyperplasia is seen in a number of immunologic states including Graves disease, collagen vascular disorders, and, most commonly, myasthenia gravis, where it occurs in about 75% of cases. This greatly enlarged thymus was removed from a patient with myasthenia gravis. Figure Thymic neoplasms. There are many possible causes for an enlarged thymus gland in adults. In normal adults, the thymus gland should be barely visible. Some of the causes are benign, but others are worrisome. These include benign thymomas, thymic carcinomas (cancers), thymic neuroendocrine tumors, thymic hyperplasia (abnormal increase in cell numbers), thymic cysts, and thymolipomas.

Thymic enlargement, while a rare phenomenon in adults, may occur, mainly after chemotherapy. This phenomenon should be included in the differential diagnosis of a soft tissue mass appearing in the anterior mediastinum on follow-up CT in adult patients particularly following treatment for cum-xxx.xyz by: May 23,  · The thymus gland enlarges during childhood, peaks in size at puberty (about 40 grams), and then begins to shrink. Normally, a combination of lymphoid cells (immune cells or lymphocytes) and lining cells (epithelial cells) makes up the thymus. Thymoma is a type of tumor that originates from the epithelial or lining cells of the thymus.

An enlarged thymus could be the result of an immune system disorder such as myasthenia gravis or might be caused by other factors, such as thymic hyperplasia, which is a cellular abnormality. The treatment for an enlarged thymus depends on the factors responsible. Congenital Disorders Several genetic defects cause thymus problems from birth. A rare condition called severe combined immunodeficiency, or SCID, develops when a person carries a mutation in a gene that regulates development of T cells.