Nonsurgical observation seems to represent an attractive alternative to surgery for asymptomatic PMC. Almost 95% of asymptomatic PMC patients are type I, and another 5% are type II and can be treated with conservative surgery. A small number of PMCs with bulky lymph node metastasis or extrathyroidal invasion are high-risk type III and require aggressive treatment.
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Sugitani et al. (2010) studied this question.
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