Review
Copyright ©The Author(s) 2020.
World J Clin Oncol. Jun 24, 2020; 11(6): 320-336
Published online Jun 24, 2020. doi: 10.5306/wjco.v11.i6.320
Figure 1
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Figure 1 Search strategy for this review. AS: Active surveillance.
Figure 2
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Figure 2 Decision flow after diagnosis of suspicious ultrasonographic thyroid nodule leading to active surveillance or surgery[8]. FNAB: Fine needle aspirative biopsy; PTC: Papillary thyroid carcinoma.
Figure 3
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Figure 3 Tumor characteristics for proper selection of candidates for active surveillance[7]. PMC: Papillary thyroid microcarcinoma; RLN: Recurrent laryngeal nerve; US: Ultrasound.
Figure 4
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Figure 4 Risk of cervical structure invasion related to tumor location (adapted from Miyauchi et al[40], 2018). Tumors composing obtuse angles with trachea, absence of normal thyroid tissue interposed between tumor and course of recurrent laryngeal nerve (RLN), and tumor location close to posterior thyroid capsule represent high risk features related to cervical structure invasion. References: A: Angles between tumor and tracheal surface: (1) Obtuse; (2) Acute; (3) Almost straight; B: Tumor location: (1) Central; (2) Anterior capsule; (3) Posterior capsule; C: Normal thyroid tissue in direction of RLN: (1) Present; (2) Absent.