[Trans-sternal cervico-mediastinal primary tumor resection and lymphadenectomy in thyroid gland cancer]

Thyroid carcinoma may invade the mediastinum by direct extension of the primary tumor or metastases to the paratracheal or retroclavicular-parajugular lymph nodes. From 1975 to 1991 in 47 out of 622 thyroid cancer patients (7.6%) [14 papillary (PTC), 5 follicular (FTC), 16 medullary (MTC) and 12 undifferentiated carcinoma (UTC)] transsternal tumor resection has been performed. Four patients (UTC three, MTC one) deceased 7, 8, 35, and 41 days after resection of the primary tumor due to cardiac or tumor disease, and in one patient because of acute arteriotracheal haemorrhage after external irradiation; no patient deceased after transsternal resection as a result of cervicomediastinal lymphadenectomy. At the time of primary operation 80% of patients showed an advanced tumor stage (greater than pT3). In 34% of patients (PTC 64%, FTC 40%, MTC 13%, UTC 25%) no tumor recurrence was observed neither by imaging nor by biochemical methods. In 18 patients a transsternal microdissection of all four cervicomediastinal lymph node compartments has been performed. Histological analyses of excised and tumor involved lymph nodes revealed in 9 patients unilateral cervical and mediastinal and in 9 patients bilateral cervical and mediastinal lymph node metastases. In the case of unilateral cervicomediastinal lymph node metastases 2 out of 2 patients with papillary and 2 out of 6 patients with medullary thyroid carcinoma could be cured surgically. In the case of bilateral cervicomediastinal lymph node metastases 3 out of 4 patients with papillary thyroid carcinoma, but no other thyroid cancer patient were free of disease. In conclusion, main indications for transsternal cervicomediastinal resection in thyroid carcinoma are (1) primary tumors extending to the upper mediastinum, but without lymph node metastases, and (2) thyroid carcinomas with unilateral cervicomediastinal lymph node metastases. In the case of bilateral cervicomediastinal lymph node metastases probable only papillary thyroid carcinomas are supposed to be curable by transsternal multicompartmentectomy.