COMEDK 2007 MCQ Answer 42

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The correct answer is C


Thymoma is not uncommon in adults, and accounts for 12% of all primary mediastinal masses. The average age at onset is the fifth decade of life and the disease is rare in children. It is the commonest tumor of the anterior mediastinum and is locally invasive in 30-50% of cases.

Thymoma involves mainly the anterior mediastinum and may rarely arise from thymic rests which are not infrequently encountered in the pericardium.

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