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. 2015 Apr 1;56(3):812–818. doi: 10.3349/ymj.2015.56.3.812

Table 4. Patterns of Spread of Thyroid Invasion.

Patient Primary site Direct invasion Lymphatic spread Vascular channel spread Multifocal invasion
1 PS lateral wall + - - -
2 PS medial wall + - - -
3 PS medial wall + - - -
4 PS medial wall + - - -
5 Post cricoid - + - +

PS, pyriform sinus.