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Definitive pathology of lymph nodes of the second operation with the microscopy and immunochemistry evaluation: (A) Recurrence of lateral cervical lymph nodes (haematoxylin and eosin, original magnification, x 100); (B) Neoplastic cells were negativity immunoreactive for calcitonin (immunoperoxidase stain for anti-calcitonin, original magnification, x 100).
