Kim Y, et al. - In this study the risk factors for lateral neck recurrence after definitive treatment of papillary thyroid carcinoma (PTC) without clinical evidence of lateral neck metastasis were studied. Clinicopathologic factors of multifocality, clinical central neck metastasis (cN1a), lymph nodes (LN) ratio, extranodal extension, and MACIS (distant metastasis, patient age, completeness of resection, local invasion and tumour size) score in N0/N1a PTC patients predicted lateral neck recurrence after thyroidectomy.