Is ectopic hamartomatous thymoma a malignancy?

Benign almost always: These lesions are benign tumors arising on the basis of a developmental defect. Medical suggest that they are derived from the third branchial arch and that they are composed of abnormal thymic tissue. This is quite an unusual disease. But is a benign tumor in virtually all reports, with no return after surgery or need for chemotherapy.

Likely: Thymoma generally considered a slow growing form of cancer that begins in the thymus. Thymomas should be removed. Individuals with thymoma should have thorough evaluation by a thoracic surgeon. The following links may provide more information: http://goo.Gl/mqtn1 and this one: http://goo.Gl/oetwz and this one: http://goo.Gl/yjnh5.