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Tumor diameter (red arrow) was 15 mm, and collapse diameter (green arrow) was 1.5 mm. As seen in this case, if multiple microinvasive areas (blue arrow-1, 3 mm; and blue arrow-2, 1.5 mm) are found in 1 tumor, the largest invasive diameter (blue arrow-1) was selected and the size was recorded. The diameter of invasive component in this case was 3 mm.
