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Introduction In the pathohistological identification of cervical lymph node (LN) metastases in papillary thyroid carcinoma (PTC), irregularities in the thyroid gland (TG) that were previously unclear are often retrospectively recognized as the primary tumor. The occurrence of LN metastases in PTC within a clinically and diagnostically unremarkable TG, devoid of evidence of a primary tumor, has been documented in the literature on just one occasion.
Knebel et al. (Fri,) studied this question.