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Reactive C cell hyperplasia as an incidental finding after thyroidectomy for papillary carcinoma.
The biologic and clinical significance of reactive C cell hyperplasia (CCH), adjacent to differentiated thyroid cancers, remains unknown. Our aim was to investigate the presence of CCH in thyroidectomy specimens with papillary thyroid carcinomas (PTC) and discuss its epidemiology and histology. In total, 413 patients were prospectively included in the study (189 benign goiters, 224 PTC). Reactive CCH was observed in 9.8% of PTC cases (32% males, 68% females, mean age 48.3 ± 16.4 years) and usually ipsilateral to the primary tumor (91%). Histologically, CCH was either focal (91%) or diffuse (9%) and almost always (92%) found in the middle or upper thirds of the thyroid lobes. Patients with PTC/CCH were generally younger than patients with benign goiters (0.027). On the other hand, patients with PTC and with PTC/CCH did not differ in terms of age, gender, basal calcitonin levels, primary tumor size, multifocality, extrathyroidal invasion, or lymph node metastasis. Thyroiditis, however, was more frequent in cases with PTC/CCH compared to PTC alone. Reactive CCH is considered a physiological response of the C cells to various stimuli, differentiated thyroid cancer among others. It bears no malignant potential and requires no additional treatment, following thyroidectomy.
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