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Line 190: | Line 190: | ||
*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=name=pmid23319214/> | |||
===Microscopic=== | ===Microscopic=== |
edits