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*Rare. | *Rare. | ||
*Usually arise ''de novo'', i.e. thymoma is not generally a precursor. | *Usually arise ''de novo'', i.e. thymoma is not generally a precursor. | ||
*Risk factors - possibly: [[smoking]], radiation.<ref | *Risk factors - possibly: [[smoking]], radiation.<ref name=pmid23319214/> | ||
===Microscopic=== | ===Microscopic=== |
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