Positive Predictive Value and Interobserver Variability of Preoperative Staging Sonography for Thyroid Carcinoma

Abstract

The T staging, bilaterality, and N1b staging of preoperative staging sonography showed high PPV. Agreements for T and N staging, multifocality, and bilaterality were moderate, substantial, substantial, and excellent, respectively.

Spectrum of Thyroid Lesions and its Clinicopathological Correlation – A Two Year Study from A Tertiary Care Centre

“…FNAC could diagnose Papillary carcinoma considering histopathology as gold standard with a kappa value of 0.64 which showed moderate agreement as in previous study (16) . As proven in previous studies, USG went in moderate agreement with histopathology in diagnosing Papillary carcinoma (17) . Among neoplastic diseases of thyroid, Papillary carcinoma was the most common (10,13,18) .…”

Preoperative Assessment of Extrathyroidal Extension of Papillary Thyroid Carcinoma

“…Interobserver agreement among the 3 radiologists was fair for 2D sonography and moderate for 3D sonography and the combined set. In the previous study, 13 the κ value for node staging showed substantial agreement, which was higher than that for tumor staging. The authors reported that this finding was due to the fact that the criteria for lymph node metastasis were more generally accepted and easily applied than the criteria for tumor staging.…”

“…Previous studies reported the accuracy of preoperative sonography for detection of extrathyroidal extension 3 – 5 , 13 ; however, they used variable criteria for assessing extension. Kwak et al 3 reported that more than 25% of tumor perimeter contact with the adjacent capsule was the most accurate measurement for predicting extrathyroidal extension if the lesion was smaller than 10 mm.…”

“…Assessment of extrathyroidal extension using the above criteria by individual radiologists is subjective. To our knowledge, there has been only 1 comprehensive analysis of interobserver variability for tumor staging 13 . Moon et al 13 reported moderate agreement for tumor staging of thyroid cancer between 2 radiologists.…”

“…To our knowledge, there has been only 1 comprehensive analysis of interobserver variability for tumor staging 13 . Moon et al 13 reported moderate agreement for tumor staging of thyroid cancer between 2 radiologists. In our study, 3D sonography and the combined set showed higher agreement than 2D sonography.…”