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Abstract
Introduction  Lymphadenectomy and thyroidectomy is standard treatment for medullary thyroid carcinoma (MTC), but the prognostic importance
of the number of lymph nodes removed (lymph node yield, LNY) and the proportion of metastatic lymph nodes resected (metastatic
lymph node ratio, MLNR) is unknown. We hypothesized that MTC survival is influenced by LNY and MLNR.

Methods  Patients (N = 534) who underwent thyroidectomy with lymphadenectomy for MTC between 1988 and 2004 were identified in the Surveillance,

Abstract
Background  Papillary carcinoma with clinically apparent node metastasis but lacking a primary carcinoma lesion in the thyroid is designated
as occult papillary carcinoma. In the era of routine ultrasonographic examination, occult papillary carcinoma is defined as
papillary carcinoma with clinically apparent node metastasis but showing a primary lesion that is microscopic or overlooked
by ultrasonography. In this study we investigated the prevalence and clinicopathologic features, including prognosis, of occult
papillary carcinoma.