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Categorizing tumors according to their relationship with the thyroid capsule on preoperative ultrasonography. (A) Intraparechymal (arrow, thyroid parenchym between capsule and tumor), (B) abutting <50% of tumor diameter (lower arrow, tumor size; upper arrow, abutting length), (C) abutting >50% of tumor diameter (lower arrow, tumor size; upper arrow, abutting length), and (D) tumor destroying the capsule (arrows).
