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KMID : 1103720160750020104
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Journal of the Korean Society of Radiology
2016 Volume.75 No. 2 p.104 ~ p.112
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The Diagnostic Utility of Ultrasonography, CT and PET/CT for the Preoperative Evaluation of Cervical Lymph Node Metastasis in Papillary Thyroid Cancer Patients
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Kim Young-Sang
Lee Tae-Hyun
Park Dong-Hee
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Abstract
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Purpose: To compare the diagnostic utility of ultrasonography (US), CT and positron emission tomography/CT (PET/CT) in the preoperative evaluation of cervical lymph node metastasis in patients with papillary thyroid carcinoma.
Materials and Methods: The study population consisted of 300 patients with pathologically diagnosed papillary thyroid carcinoma after thyroidectomy and neck dissection. Preoperative US, CT, and PET/CT findings were compared with pathologic outcomes after thyroidectomy and neck dissection.
Results: Sensitivity in detecting central lymph node metastasis (US 29.9%, CT 27.9%, PET/CT 18.8%) was lower than that for lateral lymph node metastasis (US 56.3%, CT 66.2%, PET/CT 43.7%). Specificity in detecting central lymph node metastasis (US 80.6%, CT 77.7%, PET/CT 83.0%) was lower than that for lateral lymph node metastasis (US 96.8%, CT 80.6%, PET/CT 95.2%). The combination of US and CT had higher specificity (77.3%) and higher sensitivity (33.1%) than US alone. PET/CT has no significant additional benefit over the combination of US and CT.
Conclusion: In preoperative evaluations of neck lymph node metastasis, US and CT and PET/CT are more useful in lateral lymph node areas than in central lymph node areas. The combination of US and CT has higher sensitivity than US alone.
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KEYWORD
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Thyroid Gland, Carcinoma, Papillary, Ultrasonography, Tomography, X-Ray Computed, Positron-Emission Tomography
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