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This retrospective investigation was undertaken to clarify the pattern of nodal metastasis in papillary (PTC) and medullary (MTC) thyroid carcinoma. Nodal metastases are associated with recurrence of both PTCs and MTCs. The extent of lymph node dissection is controversial owing to the lack of reliable diagnostic criteria for nodal metastases other than histopathology. Between November 1994 and October...