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Tumor size is an independent and significant prognostic factor and important for planning of surgical treatment. Although lobectomy should be chosen for patients with a tumor of greater than 30 mm in diameter, further investigation is required for tumors of 21 to 30 mm in diameter. Segmentectomy should, as a lesser anatomic resection, be distinguished from wedge resection and might be acceptable for patients with a tumor of 20 mm or less in diameter without nodal involvement.

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